7.03 avg 8 episodes 7.3 → 6.2 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Killer Lies | 7.3 | 38 |
| 2 | Cold-Blooded Killers | 7.6 | 41 |
| 3 | Murderous Women | 6.7 | 40 |
| 4 | Partners in Crime | 6.6 | 30 |
| 5 | Psychotic Killers | 7.7 | 35 |
| 6 | Deadly Desires | 7.4 | 32 |
| 7 | Science of Murder | 6.7 | 21 |
| 8 | Up Close | 6.2 | 23 |
7.37 avg 19 episodes 7.4 → 6.9 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Jealousy | 7.4 | 20 |
| 2 | Stalker | 7.3 | 20 |
| 3 | Delusional | 7.2 | 17 |
| 4 | Unsolved Cases | 8.9 | 21 |
| 5 | Cult Followers | 7.4 | 18 |
| 6 | Spree Killers | 8.1 | 16 |
| 7 | Attention Seekers | 7.7 | 15 |
| 8 | Masterminds | 7.6 | 18 |
| 9 | Revenge | 7.4 | 13 |
| 10 | Cult Leaders | 7.4 | 23 |
| 11 | Manson | 7.3 | 22 |
| 12 | Super Delusional | 7.8 | 11 |
| 13 | Schemers | 7.5 | 18 |
| 14 | Vampires/Cannibals | 7.2 | 16 |
| 16 | Redemption | 6.6 | 10 |
| 17 | Gangs | 7.8 | 17 |
| 18 | The Killer's Brain | 6.0 | 11 |
| 19 | Face to Face | 6.6 | 10 |
| 20 | Tracking Killers | 6.9 | 12 |
7.89 avg 10 episodes 8.1 → 8.6 44 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Manipulators | 8.1 | 14 |
| 2 | Control Killers | 7.9 | 15 |
| 3 | Rage Killers | 7.4 | 10 |
| 4 | Stone Cold Killers | 8.0 | 16 |
| 5 | Sexual Deviants | 8.1 | 11 |
| 6 | Fantasy Killers | 7.8 | 15 |
| 7 | Deceptive Killers | 7.3 | 12 |
| 8 | Egocentric Killers | 7.7 | 11 |
| 9 | Attention Seekers | 8.0 | 9 |
| 10 | Predators | 8.6 | 20 |
