 Mack in 1969 | |
 Mack in 2008 | |
| Shep "Mack" McAvoy | |
| Portrayed by | Shawn Colten (1969) Ed Lauter (2008) |
| Episode | One Small Step |
| Status | Alive |
Shep "Mack" McAvoy was the detective that originally investigated Danny Finch's death in 1969. He brought new evidence to the team for them to investigate in 2008. Mack convinced Rush to solve the case because it was never solved and bothered him.