A young UK student is raped and murdered. Surveillance footage traps a serial sex offender. A jazz musician and his new girlfriend are murdered a week apart by her jealous ex.

Pregnant Summer Tatum was shot twice in the head by her husband after she discovered his online affair. Andreen McDonald, a businesswoman, was killed by her husband, Andre, with a hammer.

Two cases of domestic abuse: Patricia Birmingham in the US and Marta Chmielecka in the UK, both killed by their partners, reveal the deadly consequences of toxic relationships.

Kira Steger's murder by her husband and Whitney Gray's fatal road rage shooting reveal the devastating toll of violence both in relationships and on the open road.

A woman is shot in her car by her estranged husband in front of her daughter. In the US, a Vietnam veteran is shot at home by his son over a will dispute.

The murders of Martika Ferguson and Tiffiney Crawford expose the deadly toll of disproportionate revenge.

An abandoned car is found with four bodies inside; in the UK, a woman is murdered by her stalker.

A young woman disappears after meeting up with an old flame; in the UK, a dating app-related murder unfolds.

A spree killer is on the loose in New Mexico; in Colorado, a mother is found dead inside an isolated cabin.