No direct obituary found, but information on familysearch.org is helpful.  He can be tied to his mother's obituary which shows that he predeceased her.  She passed in 2023, Mark in 2021.

Her obituary is at: https://www.dignitymemorial.com/obituaries/millcreek-ut/janice-slusser-11594825

Mark's information is shown in this link:

https://www.familysearch.org/tree/person/details/KWC2-P37