Bloodline Detectives (2020)

Name: Bloodline Detectives
Genre: Documentary
Rating: 6.5

Documentary

Detectives and forensic experts recount the most extraordinary cold cases that were solved using the revolutionary technique of familial DNA testing.

IMDb rating: 6.5 (184 votes)
Seasons: 5
Streaming (US): Amazon Prime Video · fuboTV · Peacock · The Roku Channel · Pluto TV · Plex · Xumo Play · Tubi TV · Hoopla · Fawesome
Language: EN
Type: TV series

Ratings refreshed Aug 19, 2026 · 5 seasons indexed

Seasons

7.05 avg 20 episodes 7.0 → 7.4 44 min avg

Season 1 episodes - IMDb ratings
#	Title	Rating	Votes
1	Motorway Killer	7.0	21
2	Unrighteous Act	7.1	13
3	Deadly Desire	6.5	11
4	Scottsdale Spree Shooting	6.9	8
5	Blood Bath	7.1	12
6	Road Trip to Hell	7.0	12
7	March Massacre	6.9	9
8	Murder in the Snow	7.5	14
9	Ice Cold Murder	7.2	9
10	Llandarcy Serial Killer	7.4	9
11	Sheeps Flat Murder Mystery	7.2	11
12	Carnage in Cardiff	7.3	9
13	The Rockville Horror	7.1	8
14	A Life Stolen	6.9	10
15	Walking Nightmare	7.0	8
16	Town Path Predator	7.0	7
17	The Murder of Tangie Sims	6.5	8
18	The Williamsburg Rapist	6.6	8
19	Murder Of Helene Pruszynski	7.3	7
20	The Clearfield Rapist	7.4	9

7.57 avg 20 episodes 7.2 → 8.4 43 min avg

Season 2 episodes - IMDb ratings
#	Title	Rating	Votes
1	Body in the Stairwell	7.2	12
2	Sacrilege in Sacramento	7.2	11
3	The Montana Murders	7.2	14
4	Sinful Act In St George	7.4	14
5	Left for Dead in Logan County	7.0	11
6	The Alameda Attacker	7.1	9
7	The Murder of Siobhain	7.3	11
8	Cold Case Twist	7.8	10
9	The Montana Creek Murders	7.0	9
10	San Bernardino Bodies	7.9	9
11	The Mystery Murder of Mary London	8.3	7
12	The Knifepoint Rapist	7.1	8
13	The Gunpoint Rapist	7.5	6
14	The Hunt for Precious Jane Doe	8.3	9
15	The Rapid City Rapist	7.4	7
16	A Family Torn Apart	7.9	7
17	Justice for Leslie	8.1	9
18	Cuyahoga Falls Mystery	7.5	6
19	Chilling Notes from a Killer	7.8	5
20	Remembering Stevie	8.4	8

8.03 avg 19 episodes 7.8 → 7.2 47 min avg

Season 3 episodes - IMDb ratings
#	Title	Rating	Votes
1	Date Night Murder in Michigan	7.8	6
2	The Greeley Rapist	7.9	7
3	Carla's Last Valentines	8.3	6
4	Last Seen at Dairy Queen	8.0	5
5	The Coat Hanger Killer	8.0	5
6	The Mystery of the Headphones	8.3	6
7	The Christmas Tree Lady	8.4	8
8	Little Miss Nobody	8.5	8
9	The Slaying of Sylvia Quayle	8.2	6
10	Valentine's Day Murder	8.2	8
11	The Mystery in the Parks	7.7	7
12	Murder by the Base	8.2	6
13	The Murder of Mary Scott	7.9	7
14	The Schoolbag in the Road	8.0	5
15	Her Last New Years Eve	8.3	6
16	Dancing with Death	8.0	7
17	The McCleary Rapist	7.8	6
19	The Mint Box Murder	7.8	11
20	The Telephone Cord Killer	7.2	5

7.50 avg 4 episodes 7.2 → 8.0 46 min avg

Season 4 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Norcal Rapist	7.2	6
3	Murder on Elm Street	7.4	5
4	The Mammoth Lakes Murder	7.4	5
14	Double Homicide in the OC	8.0	5

7.54 avg 14 episodes 7.8 → 8.2 45 min avg

Season 5 episodes - IMDb ratings
#	Title	Rating	Votes
1	The Body in the Blanket	7.8	5
3	The Book Store Murder	7.5	6
4	The McClintock Park Murders	8.0	5
5	Strangled in the Sand	7.4	5
6	Terror in Garden Grove	7.4	5
7	The Runaway Murder	7.1	7
8	Justice for Krista	8.2	5
9	The Imposter Rapist	6.8	6
10	The Schoolteacher Murder	7.5	6
13	Home Invasion Homicide	7.4	5
15	Finding Suzanne	7.2	6
16	Murder in Green Bay	7.4	5
17	A Murder in Lexington	7.6	5
20	Brutality in Brownwood	8.2	6