Alejandro Henriquez was convicted of murdering two children and a young woman in 1992 and was sentenced to 75 years in prison. He continues to claim that he is innocent, however. Henriquez sat down with Piers Morgan and denied his involvement, accusing the NYPD of making him a "scapegoat" for the ITV series "Serial Killers."

The Daily Mail reported that Piers Morgan entered the Sullivan Correctional Facility in New York State to interview Henriquez.

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Piers identified psychological ticks in the Bronx killer's behavior and attitude, which explained his motives.

Henriquez serving multiple life sentences

The 57-year-old received three consecutive life sentences in 1992 for the killing [VIDEO] of Jessica Guzman, Shamira Bello, and Lisa Ann Rodriguez.

They were all strangled and beaten to death with rocks. Henriquez has refused to acknowledge what he's done or show any remorse. Henriquez told Piers Morgan that his life and his family's life have been destroyed, ye he's innocent.

Morgan's documentary focuses on the national outcry over the death of Guzman in 1990. Her death led the NYPD to form a task force to solve a series of murders over the previous two years in the Bronx. Henriquez became the prime suspect as he was the last person to be seen with Jessica. Henriquez was also known by the other two victims.

Piers Morgan worked alongside FBI legend James Fitzgerald

According to The Sun, Piers Morgan called on James Fitzgerald, the man responsible for catching "The Unabomber" Theodore Kaczynski, as they explored the case and investigation.

Fitzgerald analyzed Alex's behavior. Fitzgerald said that psychopaths are control freaks and want to control others through lies and manipulation. Fitzgerald was recently called in by the FBI to assist with the Austin bombing case [VIDEO].

Fitzgerald said that he kept going after these girls, which indicated that maybe his activities with women closer to his age were not going quite the way he would have liked. Piers Morgan attempted to get a confession from Alejandro Henriquez.

At one point during the interview, Alejandro Henriquez lost his temper as Piers Morgan continued to interrogate him. Morgan and Henriquez were discussing a fact that only the killer would know and Morgan pressed him on it, resulting in Henriquez getting frustrated with Morgan and calling those who analyzed the evidence liars. After a heated moment, Piers Morgan branded him a masterful liar -- a sentiment shared by many involved in the investigation.