Tommy King (died 1975) was a Boston mobster and member of the Mullens during their gang war against Donald Killeen and his lieutenants Billy O'Sullivan and James J. Bulger during the early 1970s.
Following Killeen's murder in 1972, he became an associate of Bulger and the Winter Hill Gang after his alleged involvement in the death of Paul McGonagle.
The Killeen brothers - Donald, Kenneth, George and Edward - were an Irish-American crime family which ran the bookmaking and loansharking in South Boston, Massachusetts.
In 1971, Donald Killeen's younger brother, Kenneth, bit off the nose of Mickie Dwyer, a member of the rival Mullen Gang, at The Transit, a local watering hole.
His brother, Paulie McGonagle vowed revenge and according to Patrick Nee personally murdered O’Sullivan near his house at Savin Hill at just past midnight on the morning of March 28, 1971.
On May 13, 1972, South Boston mob boss Donald Killeen was shot to death by Mullen gang enforcer Jimmy Mantville outside his home in suburban Framingham, Massachusetts.
These included former Mullens Spike O'Toole and Paulie McGonagle, who was murdered by Bulger and buried in a shallow grave in Boston's Tenean Beach.
It is also alleged that Bulger had direct involvement in the murders of Eddie Connors in January 1975 and Mullens Tommy King and Buddy Leonard in November 1975.