Yup, this isn’t really all that unheard of anymore.
With the strides that have been made in forensics, it’s not as hard as it used to be.
I was reading one Ann Rule’s books not long ago, and she discussed one of the first no-body murder cases in Oregon.
They used blood and hair evidence to convict a man of murdering a bus driver.
This was 1976, but no body, no DNA, no advanced testing of any kind; no problem.
The perpetrator was sentenced to death, had his conviction commuted to life, and was ultimately released.
She used a pseudonym, but I figured out his real name. He recently passed away.