Antonio “Wilson” Peña, who is awaiting trial on charges that he masterminded a murder-for-hire plot in New London last year, is cooperating with the state’s investigation of his brother-in-law’s stabbing death on Sept. 12.

Javier Reyes, 36, the brother of Peña’s wife, was stabbed multiple times Sept. 12 at the Huntington Street apartment where Peña’s family resides. New London police are investigating.

Peña, 36, who is being held in lieu of $2.2 million in bonds while his murder-for-hire case is pending, recently met with authorities about Reyes’ case, according to his attorney, William Gerace. Peña will meet with a state’s attorney again to review video surveillance at the Huntington Street apartment on the night Reyes was killed.

“He’s eager to cooperate,” said his attorney.

Police and prosecutors have not confirmed whether Reyes’ stabbing death and the alleged murder-for-hire in August 2011 are connected.

Police said they responded to the Huntington Street apartment at 10:34 p.m. Sept. 12 to find Reyes suffering from serious injuries to his abdomen. He died early the next morning at Yale-New Haven Hospital. The state Office of the Chief Medical Examiner ruled that he died of multiple stab wounds and was a homicide victim.

The address where the homicide occurred, Apt. D14, is the same one Peña gave to police last year when he was arrested on charges that he orchestrated a murder-for-hire plot against an acquaintance, Oscar “Tato” Valentin, with whom he once dealt drugs.

According to court documents, Peña planned to pay $5,000 to Gerardo Carrillo, 26, of 64 Fawn Hill Drive, Westbrook, and $10,000 to Elmer A. Melendez, 28, of 208 Crystal Ave. Tipped off by an informant, the police pulled over the informant, Carrillo and Melendez after the informant and Carrillo had picked up Melendez at his apartment.

Peña, who was in a drug rehabilitation program, was arrested later that day.