A key witness has changed his story about who was involved in a home invasion last year on P.E.I.

Chase James Roper is already serving a prison sentence for his involvement in the home invasion in Emyvale on May 28, 2012.  On Tuesday he testified at the trial of Derry Ian Bird, who is charged with breaking into the Emyvale home with Roper.

In videotaped interviews with police shortly after his arrest and shown in court Tuesday, Roper said Bird went with him to the home in Emyvale. There, the two men broke down the door of a drug dealer's home, held a gun to his head and stole his money and stash of drugs.

On the witness stand Tuesday, Roper testified Derry Bird was not involved. He flatly contradicted statements he made it the taped interview with police. He told the court his accomplice was a stranger whom he had met just a few days before the home invasion.

Targeted by fellow inmates

Crown prosecutor Cindy Wedge questioned Roper's motives for changing his story. She presented evidence that Roper has been targeted by fellow prison inmates for testifying in this case.

She suggested he's changing his story to protect himself.

Defence lawyer Brendan Hubley argued Roper was manipulated by police into making false statements.

Chase Roper's girlfriend also took the stand Tuesday. She, too, is in jail for her part in the home invasion. She testified that Derry Bird did it, much as Chase Roper said in his videotaped police interviews.

The trial continues all week.