SPOKANE, Wash. — The Spokane Police Department's Major Crimes Unit is searching for a man in a truck who spoke to Ricky Coffee on the night of May 11 in the parking lot of a north Spokane Walmart.

According to a press release, Coffee and the man spoke about the headlights of the truck shining on Coffee. Police said the man is not a suspect or a person of interest, but they are instead hoping the man could provide information about Coffee's disappearance.

The man and Coffee spoke at the Walmart located at 9212 North Colton Street on May 11, according to the release. The Major Crimes Unit is asking for the public's help in finding the man in the truck who spoke with Coffee.

SPD said they are working to get a copy of the surveillance video to share with the public.

Coffee's sister said he went missing on May 11 after an argument with someone at the Walmart about his sexuality. She also told KREM that Coffee called his mother Freida following the argument and that Frieda told him to cool off before driving.

Coffee told his mother to leave the door unlocked because he was carrying groceries, according to his sister.

Coffee's body was found in the Spokane River on June 1. Coffee was 56 and last seen on May 11. 

RELATED: Body of missing man Ricky Coffee found in Spokane River

RELATED: Major Crimes Unit investigating after Spokane man missing for nearly a week