Witness TO A Killing

Assassins (1995)
Assassin Robert Rath arrives at a funeral to kill a prominent mobster, only to witness a rival hired gun complete the job for him -- with grisly results. Horrified by the murder of innocent bystanders, Rath decides to take one last job and then return to civilian life. But finding his way out of the world of contract killing grows ever more dangerous as Rath falls for his female target and becomes a marked man himself.

Monsters of Man (2020)
A robotics company vying to win a lucrative military contract team up with a corrupt CIA agent to conduct an illegal live field test. They deploy four weaponized prototype robots into a suspected drug manufacturing camp in the Golden Triangle, assuming they'd be killing drug runners that no one would miss. Six doctors on a humanitarian mission witness the brutal slaughter and become prime targets.

Storm (2009)
Hannah Maynard, a prosecutor of Hague's Tribunal for war crimes in former Yugoslavia, charges a Serbian commander for killing Bosniaks. However, her main witness might be lying, so the court sends a team to Bosnia to investigate.

Midnight Stalker (2002)
Natsuki is a blind woman whose best friend Yoko gets killed by a stalker Mizuno. Oddly enough, she is at the scene of the crime and is the only witness, although she has not seen the killer. In order to cover his own tracks, the killer begins stalking her with the intent of killing her...