This Halifax Street apartment is less than a block away from the Regina General Hospital. (CBC)

Regina police have combed an apartment unit for clues in the case of a severely injured man whose family claims he may have been subjected to prolonged torture, CBC News has learned.

The raid took place Tuesday in an apartment building about half a city block from the Regina General Hospital, where Dustin LaFortune, 26, was dumped in mid-April, suffering from disturbing injuries, including burns and cuts.

LaFortune, who'd been missing a few months, was also severely emaciated.

The circumstances of the assault remain a mystery, but family members have said they believe a former roommate is involved.

Dann McKenzie, a tenant in the Halifax Street apartment, says he heard disturbing sounds in the unit above his. (CBC)

The landlord of the Regina apartment building, on Halifax Street, told CBC News that someone used Dustin LaFortune's identification when it came time to sign a rental agreement for the unit. The landlord, Harvey Cruikshank, said he wasn't sure if it was LaFortune himself or someone using the man's ID.

A resident of the building, who spoke to CBC on Wednesday, said he recognized pictures of the person the family suspects is responsible for LaFortune's injuries.

"Yeah, that guy lived here," Dann McKenzie said. "That is the guy who lived right above me."

McKenzie said he remembers the new tenant arriving in mid-March.

McKenzie said he never saw a second person in the unit but remembers hearing screaming, shouting and other disturbing noises coming from the apartment.

Pictures of Dustin LaFortune of Winnipeg before and after his disappearance. His family believes he was tortured for a prolonged period before he was dropped off at a Regina hospital. (Facebook)

"The sound when someone hits someone, that flesh-on-flesh," McKenzie said. "It's sort of unmistakable."

He said he banged on his ceiling and finally complained to the landlord. In early April, the noises stopped, said McKenzie, who now wishes he had taken his concerns to the police.

Regina police would not confirm they were in the apartment. They have only said they are investigating a case of serious assault.

LaFortune is originally from Winnipeg and his family said he moved to Calgary to work with a moving company there. Family members said they lost contact with him in February.