According to a RCMP update issued midday on Wednesday, Peter was one of the masked men believed to have murdered Wendland. He also locked three youths in the bathroom of the house, tacking a forcible confinement charge onto his murder charge.
RCMP requests anyone with information about Peter to call the RCMP historical case unit north or crime stoppers.
Last Friday, Peter's alleged accomplice, Dennis Henry Hahn of Surrey, British Columbia, was arrested in Surrey, and charged with first degree murder and unlawful confinement.
Charges against the two accused stem from an incident on Dec. 14, 1985., a day that saw area temperatures drop to -16 degrees and wind gusts jump to 35 kilometres per hour.
Two masked men entered Wendland's home in Rosthern, Sask., a town approximately 67 kilometres north of Saskatoon.
The men allegedly locked three girls in a bathroom in the house.
When the group escaped, they found Wendland dead.
Up until last Friday, the only charge laid in the case was in 1990: an adult male appeared in Saskatoon Queen's Bench court, and was charged as an accessory to the murder of Wendland.
The RCMP reopening the cold case in 2011 allowed them to pursue and charge both Hahn and Peter.