Authorities are looking for a 22-year-old in connection with the death of a Brooklyn teen who was gunned down inside his apartment building last month.

Martial Amilcar is being sought as a person of interest in the fatal shooting of 15-year-old Samuel Joseph, police officials said.

“He indicated that he was looking for the bother… but again we don’t have him in custody yet,” Chief of Investigation Williams Aubrey said Monday when asked about the motive during a press conference.

Joseph was killed inside his apartment building on Feb. 22 in what his family believes was a case of mistaken identity.

The teen was found dead just before 6 p.m. in the entrance of the building with gunshot wounds in face, neck and chest.