The death of rapper Christopher Wallace, known professionally as the Notorious B.I.G. and Biggie Smalls, has never been solved. Wallace was killed in March 1997 in Los Angeles when someone opened fire on his vehicle.
In 1958, a then-14-year-old Cheryl Crane, daughter of actress Lana Turner, stabbed her mother's boyfriend, Johnny Stompanato. Crane told police that Stompanato, who had ties to organized crime, had threatened her mother with a knife. Here, Crane is shown with three unidentified men at the time of her trial, which resulted in a ruling of justifiable homicide.
Vladimir "Spider" Sabich was an alpine ski racer who died in March 1976 after being shot by his girlfriend, singer and actress Claudine Longet. Longet was convicted of criminally negligent homicide and sentenced to 30 days in jail. She married her defense attorney, Ron Austin, in 1986.
John Lennon -- seen here in 1969 with his wife, Yoko Ono -- was shot and killed in December 1980 outside of his apartment building in New York by Mark David Chapman. Chapman remains jailed.
Probably one of the most famous cases ever involving a celebrity, O.J. Simpson, center, was arrested for the murders of his ex-wife, Nicole Brown Simpson, and her friend Ron Goldman in 1994. Here he confers with attorneys Johnnie Cochran, left, and Robert Shapiro during a hearing in 1995. Simpson's friend Robert Kardashian stands behind him. Simpson, a former professional football player, was acquitted in the criminal case.
The murder of rapper Tupac Shakur remains unsolved. Shakur was shot and killed in Las Vegas in September 1996.
The marriage of "Saturday Night Live" star Phil Hartman and wife Brynn ended tragically in 1998 after she shot him to death in their bed and then took her own life.
Sean Combs, then known as "Puffy," is flanked by security and court guards as he leaves the first day of his trial in January 2001 in New York. The rapper/producer was charged in connection with a 1999 shooting in a New York nightclub. He was found not guilty of all charges.
Actor Robert Blake is found not guilty of murdering his wife, Bonny Lee Bakley, in 2005 in Van Nuys, California. Bakley was shot in the head while sitting in the couple's vehicle.