UPDATE: Camacho was captured in Mexico City on 10/30.

A beefy East Boston teen with a lengthy record of violence is being sought for the triple shooting that left one dead at King Arthur's Lounge in Chelsea last week.

Jesse "Fat Jesse" Camacho, 19, is wanted for the murder of Jeff Santiago of Everett and two counts of armed assault with intent to murder for shooting the other two men. Not surprisingly, Camacho has gone into hiding; the Suffolk County DA's office held a press conference this afternoon to seek the public's help in finding him. DA Dan Conley said:

Our investigation has revealed that a verbal altercation between two small groups of men erupted inside King Arthur's shortly after midnight. Within moments, that verbal altercation escalated to physical violence between the two groups. During that clash, Camacho produced a black handgun from his waistband and fired it multiple times, striking three victims: a 29-year-old Everett man believed to be part of the victim's party, a 41-year-old Charlestown resident who worked at the establishment, and Mr. Santiago.

Camacho is also known as "Baby Jay" and "Syke." He's between 5'5" and 5"7" and weighs about 280 pounds. Officials described him as armed and dangerous; the Globe details his violent record.

One wonders if Chelsea officials might also be investigating how a 19-year-old wound up in a bar after midnight.