James "Whitey" Bulger, the reputed former head of Boston's Winter Hill Gang, evaded police for 16 years before being arrested with girlfriend Catherine Greig in Santa Monica, California, in 2011. Seen here in a 1984 FBI photo, he is facing trial for racketeering, extortion and 19 counts of murder. 
According to prosecutors, Bulger's crew learned that a bookie named Richard Castucci was cooperating with the government, and John Martorano was sent to kill him. Castucci was shot in the head and stuffed in a sleeping bag in the back of his car. 
Steve "The Rifleman" Flemmi, left, and bookie Dick O'Brien in one of several surveillance photographs entered into evidence in the Bulger trial. Flemmi, Bulger's partner, would meet O'Brien to collect thousands of dollars in "taxes" every month. 
Flemmi's stepdaughter, Deborah Hussey, was allegedly murdered in 1985 by Bulger because she knew that Flemmi was an FBI informant. 
Flemmi met Debra Davis at a jewelry store, and the couple dated for more than seven years. In 1981, Bulger is said to have killed Davis because she knew that Flemmi was an informant. 
Bulger is accused in the slaying of Roger Wheeler, a wealthy businessman who was gunned down outside a country club in Oklahoma in 1981. 
Bulger was the godfather to John Martorano's first son. Martorano has admitted to 20 killings as part of Boston's Winter Hill Gang and is the government's star witness against Bulger. 
Prosecutors said they found more than $800,000 in cash and 30 weapons, including handguns, an automatic rifle and a hand grenade, when Bulger was arrested in 2011. 
Photographs of weapons that officials said belonged to Bulger at the time of his arrest in 2011. 
Photographs introduced as evidence show weapons allegedly belonging to Bulger at the time of his arrest in 2011. 
In 2008, John Martorano testifies against former FBI agent John Connolly, who was accused of helping the Boston mob kill gambling executive John Callahan in 1982. 
Former FBI supervisor John Morris testified at Bulger's trial on Friday, June 28, saying that he provided information to Bulger in exchange for money and gifts. Here, Morris testifies during the John Connolly murder trial in Miami in 2008. 
Connolly was convicted of second-degree murder in the slaying of John Callahan and received a 40-year sentence in 2009. 
Bulger's booking photo from June 23, 2011. 
Bulger's girlfriend, Catherine Greig, was sentenced to eight years in federal prison in 2012 for identity fraud and helping the reputed mob boss avoid capture for 16 years. 
J.W. Carney, Bulger's defense attorney, arrives at the U.S. Federal Courthouse for the start of Bulger's trial in Boston on Wednesday, June 12. 
This undated surveillance photo released on Monday, July 8, by the U.S. Attorney's Office at federal court in Boston shows Bulger, left, with his former right-hand man, Kevin Weeks. Weeks took the witness stand at Bulger's racketeering trial and described a double slaying, multiple extortions and drug dealing. 
Bulger and Weeks walk around Castle Island on Boston Harbor. 
Weeks leaves the courthouse on July 8 after testifying in graphic detail about how Bulger killed Arthur "Bucky" Barrett, Joey McIntyre and Deborah Hussey. 
Mug shots of Bulger in 1953. 
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- Former drug dealers, families of victims, forensic dentist take the stand Friday
- James "Whitey" Bulger is charged in the deaths of 19 people over two decades
- Former drug dealer says his brother was shot when he refused to pay "rent" to Bulger
- Wife of slain man says after testimony: Bulger "is a coward"
Boston (CNN) -- An array of witnesses testified Friday in the 20th day of the federal trial of reputed Boston mob boss James "Whitey" Bulger: Former drug dealers, family members of alleged victims and a forensic dentist all took the stand.
Some of Friday's most interesting testimony came when former drug dealers detailed the scare tactics they said Bulger used, including extortion and shooting one of their brothers.
Bulger is charged in the deaths of 19 people during some two decades when prosecutors say he ran Boston's Irish mob. He also faces charges of extortion, racketeering and money laundering.
The rules of the street
Paul Moore testified about the rules of the street when he was dealing drugs in Boston the early 1980s. Zach Hafer, assistant U.S. attorney, asked Moore whose permission he needed to sell drugs in South Boston.
"Jimmy Bulger, Whitey," Moore replied.
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Shooting survivor speaks at Bulger trial To sell cocaine in South Boston, Moore said that and his partner, Billy Shea, had to pay "rent," a weekly or monthly fee to Bulger and his gang. Rent payments to Bulger's gang were between $3,000 and $5,000.
"If you didn't pay, you'd get hurt," explained Moore.
Anthony Attardo, another former drug dealer, testified that he didn't pay "the rent," and then failed to pay a $100,000 fine for the missing rent payments. Attardo's brother was shot.
"What happened after he was shot?" Hafer asked.
Attardo replied that Bulger and his long-time associated Kevin Weeks came to his house and said "you're next."
Attardo said he gave Bulger $80,000 and Bulger told him not to worry about the rest.
Families share their outrage in court
In addition to hearing about the crime world's rules for drug dealing, the jury went on to learn about the heartbreaking loss the families of murder victims suffered.
Steve Davis, the brother of Debra Davis, became emotional talking about his younger sister, whom he also called his best friend.
Davis told the court his sister was dating Steve Flemmi, Bulger's partner. One day, she just didn't come home. "Did you ever see your sister again?" Hafer asked.
"Not until yesterday," answered Davis in reference to the pictures of her remains that were shown in court.
As Davis was getting off the stand, he held a photo of his sister toward Bulger, who would not look up. Davis later told reporters outside the courthouse, "I wanted recognition from him. He's been sitting with his head down."
Another relative of a victim, Patricia Donahue, spoke about the agonizing wait she endured to find out what had happened to her husband.
Donahue told the court that while she was preparing dinner, she heard a TV news announcement of a gangland slaying -- and then she saw a picture of her father-in-law's car, which she knew her husband had been driving.
"I called every single hospital in the Boston."
Michael Donahue, who was not affiliated with any gang, was giving his friend Brian Halloran a ride home from a bar that night.
Earlier in the trial, disgraced former FBI agent John Morris had apologized to Donahue's family. Morris said that he leaked information to Bulger that Halloran was about to disclose details of Bulger's gang.
After court, Patricia Donahue spoke about testifying in front of Bulger.
"He couldn't look at me. If he can kill people and not look victims in the face, he is a coward."
Forensic dentist identified two bodies
Jurors also heard testimony from forensic dentist, Dr. Kathleen Crowley. She was able to positively identify the remains of two alleged Bulger victims.
The specific details of the dental work that helped identify Arthur "Bucky" Barrett's remains included a root canal, Crowley explained. Earlier in the week, Bulger's long-time crime associate, Kevin Weeks, testified that he saw Bulger shoot Barrett in the back of his head after Barrett had tried to buy his way out of death.
Using the same forensic methods, Crowley was able to determine that a different set of the remains belong to John "Joey" McIntyre. Weeks alleged that Bulger killed McIntyre after McIntyre admitted to letting authorities capture drugs that Bulger's gang had intended to sell.
So far the prosecution has called 46 witnesses. The prosecution expects to call 20 more witnesses, including Flemmi, and believes it could wrap up in 10 days.
Thursday: Jurors view photos of alleged victims' remains
