Unknown Serial Killers of America (2025)

Biography · Crime · Documentary

Explores the chilling cases of lesser-known serial killers whose crimes went unnoticed for years, leaving a trail of fear and unsolved murders before they were finally caught.

IMDb rating

7.2 (120 votes)

Episode average

7.1 -0.1 vs IMDb

Seasons

2

Status

Still airing

Streaming (US)

Peacock

Language

EN

Type

TV series

Declining trajectory: each season no better than the last. Rising Shows ranks whole shows by the shape of their rating trend rather than one average score, which is how you find a show that got better rather than a show that started well. See every Declining show in the explorer →

Ratings refreshed Oct 3, 2026 · 2 seasons indexed