BOSTON -- A retired Cambridge police officer was shot dead in his Dorchester home Tuesday night.

The victim was a former motorcycle officer, according to family members who talked to NewsCenter 5 at the scene Tuesday night. They said he's been working recently as a carpenter.

Relatives told NewsCenter 5 that Myles Lawton, 64, lived in the apartment at 91 Florida Street with his longtime girlfriend and their children.

Just before 9:30 p.m., while the retired Cambridge police officer was home with his family -- including an infant son -- Lawton was shot in the mouth and killed.

A friend of Lawton's who was with him was also shot and rushed to Boston Medical Center with life-threatening injuries.

Police haven't commented the double shooting.

Lawton's family members said they have no idea why someone would want to shoot the former motorcycle cop.

Police said they are looking for at least one suspect.