A Calgary murderer will have to wait a while longer to find out what his sentence will be while authorities investigate whether he was abused while in custody.

Mohamed Karim was convicted in the death of Jack Beauchamp, 49, the head of a mortgage lending company, who was shot six times and found dead in his downtown office in January 2006.

But in September when he was in court for sentencing, Karim’s lawyer asked for an investigation after Karim told him he was manhandled by one guard and sexually assaulted during a cavity search while at the Calgary Remand Centre.

Michelle Davio says the Solicitor General's department then launched an investigation.

Lawyers for Karim now have a video tape, showing Karim in his cell at the Calgary Remand Centre two years ago.

But just before he is allegedly assaulted, the video goes blank.

On Tuesday, a judge approved asking the Calgary Police Service to try to find the original video at the remand centre.

Some lawyers and police officers have seen the alleged assault, but nobody has a copy and it is unknown if the original video still exists.

Adriano Iovinelli, Karim’s lawyer, says the process had been frustrating.

"Mr. Karim has been adamant he was assaulted and for two years we wait for the video," Iovinelli said.  "After two years, we get an order for the video and it's been altered in one fashion or another.  I'm not saying it was at the remand or the (Calgary Police Service), but at the end of the day, it does not depict what was on there before."

Iovinelli also says the video of the alleged assault by guards could impact what sentence he receives.

"Of course it can," Iovinelli says. "If a person is treated poorly at the remand centre, that can be a factor taken into account as to what the appropriate sentence should be and Mr. Karim is adamant that his treatment at the remand centre has been deplorable."

Karim's next court appearance is Feb. 15.