Jeff Pelley is trying to get a new trial. He’s now 50 and has been in prison since being convicted of the 1989 murders of his father, step-mother and two step-sisters, who were 6 and 8 at the time, at their Lakeville home on prom night.

Pelley was charged in 2002 and convicted in 2006, and was sentenced to 160 years in prison.

The hearing that is being held this week is to present evidence that Pelley may not have been the killer. His attorneys contend that police railroaded him and did not consider other suspects or scenarios.

Pelley’s team presented a videotape Tuesday they say shows that Pelley’s father, who was a minister, told a parishioner that he was not actually a minister and had been involved with some sinister dealings and people who he believed would kill him and his family.

Pelley, now 50, has been working for years on getting the new evidence together. His lawyers say prosecutors and police were “reckless” and “deceptive” during the trial.

Police and prosecutors contend that Pelley murdered his family after an argument over whether he could go to prom.

If the judge finds the new evidence compelling, he could order a new trial. Prosecutors may also decide to dismiss charges if they also find the new evidence compelling.