Two masked men entered a ward at May Pen Hospital and shot patient Adiff Washington, 37, four times, The Gleaner of Kingston, Jamaica, reported.
Witnesses told the newspaper the gunmen surprised security guards outside Washington's ward.
They said one of the masked men put a gun to the head of a security guard while the other entered the ward and killed Washington.
The victim, who was out on bail pending trial for attempted murder and kidnapping, was recovering from a gunshot wound he received on Sunday.
Jamaica's Independent Commission of Investigations said Washington told an investigator that he had been shot by a member of the Jamaica Constabulary Force.
A relative of Washington's said he should have had a police guard while in the hospital.
N.J. man wakes up from 10-hour sleep with knife in back
Puzzle-maker slips 'Murdoch Is Evil' into Rupert Murdoch's Sunday Telegraph