Shotgun and the Heckler and Jigsaw

Three more rereads from Ed McBain.
First, "Shotgun". A couple is found dead in their apartment with shotgun wounds to the face. Not a pretty sight. After much legwork, the detectives find out that the man killed was not the husband but the woman's lover, and it was the husband that killed them both, using a shotgun to distort the features, making identification harder, so he could continue to live his life. I sympathize with cuckolded husbands, but really, murder? It's a little extreme.
"The Heckler" is an earlier one. The plot takes points from an Arthur Conan Doyle's Sherlock Holmes story, "The Redheaded League" (which I highly recommend--anything about Sherlock Holmes!). Anyway, seemingly random local businesses are getting harassing phone calls, telling them to leave by the end of the month or die. One business, the one directly above a bank, gets phony deliveries of food, goods, all kinds of crazy stuff. One day an ad appears in the paper that the business is looking for redheaded girls to model their dresses, and boy, do they show up out of the woodwork! The boys at the 87th figure the heckler is trying to run the guy out of his loft so they can rob the bank below. Almost...but not quite. This book marked the first appearance of the Deaf Man, and it's a good one.
"Jigsaw" finds the boys trying to solve a 6 year old robbery. A bank was held up, and $750,000 was stolen and never collected. All four thieves died in a car wreck almost immediately after leaving the scene of the crime, but the loot wasn't in the car, meaning they dumped it somewhere for later pickup. An insurance investigator thinks he knows where the drop off point was, but he needs the 87th's help. Apparently the criminals took a picture of the spot, and cut the picture up into 8 pieces, and distributed it amongst themselves, giving their pieces to family or friends for safekeeping. The insurance investigator would like the boys to help him collect the pieces and find the money. Unfortunately, people in possession of said pieces are mysteriously dying.