MACAULAY CULKIN is “adopt­ing” a convicted killer!

The ENQUIRER has learned that the former child star has reached out to Mi­chael Alig, the man he played in the 2003 film “Party Mon­ster.”

Alig was released from prison on May 5 after serving a 17-year sentence for mur­dering and dismembering his drug-dealer roommate, Andre “Angel” Melendez, in 1997, reportedly over a drug debt.

“Mac’s ‘adopting’ him in a way,” said a source.

 “Since Michael was once a night­club promoter, Mac’s going to see if there might be a spot for him to help do publicity and marketing for his band, The Pizza Underground, or maybe even work as a roadie.”

Another insider says that the 33-year-old “Home Alone” star empathizes with Alig, 48.

“Not only did he play the guy in a movie, which went on to be a cult classic and was the last noteworthy film Mac has done to date,” the insider said, “but he relates to Alig because both of them had gone down the wrong path by doing drugs, as well as having had run-ins with the law.”