The First 48 Knock Knock (2004– ) Online
- Original Title :
- Knock Knock
- Genre :
- TV Episode / Crime / Mystery / Reality TV
- Year :
- 2004–
- Cast :
- Dianna Baumann,Matt Frazier,Dion Graham
- Type :
- TV Episode
- Time :
- 42min
- Rating :
- 8.2/10
Police must wade through a web of secrets and lies when a man is found dead in his Tulsa, Okla., hotel room.
| Episode credited cast: | |||
 | Dianna Baumann | - | Herself - Det., Tulsa Homicide |
| Matt Frazier | - | Himself - Det., Tulsa Homicide |
 | Dion Graham | - | Narrator |
| Michael Jones | - | Himself (archive footage) |
| Ronnie Leatherman | - | Himself - Det., Tulsa Homicide |
| Justin Ritter | - | Himself - Det., Tulsa Homicide |
| Nathan Schilling | - | Himself - Cpl., Tulsa Homicide |
| Dave Walker | - | Himself - Sgt., Tulsa Homicide |
| Mike Zenoni | - | Himself - Det., Tulsa Homicide |