Man from Texas goes missing without a trace

Gregory Keith Mann Jr.

He also went by Ron Roberts.
He was working at Ford in Wichita Falls, Texas in 1997.
He was last at work on May 10, 1997 and sold two vehicles. 

He had plans to deliver one of the cars after the upcoming weekend.
He borrowed a demonstration vehicle to use for the weekend.

He selected a red 1996 Ford Mustang and requested a gasoline voucher.

It is believed that he filled the car's tank after leaving work that evening.
He returned to his residence in Fountaingate Apartments on Barnett Road.

He spoke to his fiancee on the telephone during the evening and they planned to meet the following day.

Mann, along with two of his friends, stopped at the Fina gas station on McNiel Avenue and Kell Boulevard a little while later.

Security camera videotape shows them inside the store at 10:00 p.m. 

Then they visited a McDonald's restaurant before going mudding in one of the friends' vehicles.
Mann said that he needed to return home while his friends cleaned the automobile at a local car wash. 

He said that he was meeting someone at 12:15 a.m. the next day, but did not mention a name or location.

It was around 11:45 as his friends watched as he walk up the stairs towards his apartment. 

They did not see if he went inside or not.

That was the last time he was ever seen or heard from.

The next morning, the vehicle that he was using was discovered by his parents, abandoned in a church parking lot near their home near the 4300 block of McNiel Avenue.

The trunk was partially open and a side panel was apparently lowered inside the compartment. 

The inside had been cleaned and there was nothing in there, except for an audio cassette inside the stereo. 

The car doors were locked, and the alarm system had been turned off.

Mann's fiancee said that she did not believe Mann slept at his apartment the previous night. 

All of his personal belongings were inside his apartment.

$100 was in his savings account and never retrieved his paychecks from work. 

He used his fiancee's credit card at the gas station when he was with his friends mudding the night before.

Mann's fiancee planned to move into his apartment in 1997. 

Foul play is suspected in Mann's case.

What do you think happened?

Could whomever he was meeting at midgnight with have done something with him?

Or was it his friends that were the last to see him alive?