Cape Cod cold cases

A 1974 murder was solved in 2018 by Joe King, son of horror writer Stephen King. What other solved or ongoing investigations into cold cases are you aware of on Cape Cod?

https://www.providencejournal.com/story/news/2018/08/07/stephen-kings-son-jaws-may-hold-clue-to-unsolved-1974-cape-cod-murder/6534225007/