Knives Out(2001)

Harlan Thrombey (Christopher Plummer) ultimately did kill himself, by cutting his own throat. He believed he was going to die in 10 minutes from a morphine overdose, accidentally administered by his nurse Marta (Ana de Armas). He kills himself after telling Marta how to get away with it. He has great fondness for her and didn’t want her to get in trouble for his death. Unbeknownst to her, he had recently changed his will to give her his entire estate, cutting off his entire family financially. If Marta had been found responsible for his death, she would have gotten nothing.

But it turns out Harlan would have lived if he’d let Marta call 911. His grandson Ransom (Chris Evans), who’d had some medical training, had switched medications in their vials in Marta’s medical bag, intending on using Marta as a proxy to kill his grandfather for cutting them all off financially. But Marta, going by the feel of the vials in her hands rather than the labels, had actually given the right medications. She had panicked when she saw the labels were wrong, but if Harlan had been taken to the hospital, he would have been all right, and it would have been a different investigation entirely.

The housekeeper Fran (Edi Patterson) witnessed Ransom going through Marta’s medical bag. Fran intends on blackmailing him with the toxicology report that would have proven Marta’s innocence. In response, he overdoses her with morphine and tries to frame Marta for that murder too. He also sets the medical examiner’s office on fire, destroying all samples and records, so his deception can’t be discovered.

With Benoit Blanc’s (Daniel Craig) wit and Marta’s quick thinking, Ransom ends up confessing to the whole plot, and is arrested. Marta ends up inheriting Harlan’s entire estate, although how much she helps the rest of the family remains to be seen.