The detective went to stand with Inspector Lestrade a little way back giving John room to examine the body in the boot of the car.
When John remarked on the cut Sherlock rejoined the doctor and looked carefully at where the doctor was indicating.
“Excellent. That narrows it down, a very sharp glass shard, John, not an instrument. 6 hours, 6 hours. First class.”
“Ok, what you can you tell me?” Lestrade asked unfolding his arms and walking over to the car.
Sherlock, deep in thought, wearing his least readable blank expression, checking his deduction in the light of what John had added paused before answering.
Lestrade looked disappointed, “I hope you have something.”
Sherlock smiled “More than something. But I’ll need more samples than normal to confirm it and give you the details. I'll do the analysis at Barts as usual. Much quicker.”
“Of course, so what's your theory?” Lestrade asked a little impatiently.
“This is a complex one, I'll need a dozen of Anderson's evidence sample canisters.” Sherlock replied.
“No problem.” Lestrade turned and ordered Anderson to bring what Sherlock had asked for.
Anderson who had been watching gritted his teeth and stalked off to the van for the canisters”
“For now, he is a probably a travelling sales rep who worked for something like a printer's, right handed, suffered from iron deficiency and he's a bigamist who owns two dogs. It's not premeditated murder but obviously it's not an accident either." Sherlock explained his theory.
“How do you know that?” Lestrade was taken aback, his eyebrows perched high on his forehead.
“I don't know, I see, I won't know until I do the lab work” Sherlock began slowly. Then he began speaking quickly while moving round the car indicating the evidence as he explained his deduction.
“But...this is a man who's longest daily walk is from his front door to his garage. The blow to the back of the head felled him but it didn't kill him, nor did the laceration to his arm, his age and condition suggests a heart attack. Why? Fright, not just surprise, he was unexpectedly attacked.”
“There is green slime and moss in the head wound. He was looking forwards when his attacker struck him with possibly a tree branch or a fence pole, wet wood. Wood that his attacker picked up at the scene of crime. Bashed on the head, he falls. His left hand is deeply scraped, that means he put it out when he fell, the force of the fall caused a sharp piece of glass to lacerate his skin.”
“He has a wide wedding ring which he takes off and he puts a smaller one back on. You can see there is a groove of the narrower, tighter wedding ring, that's overlaid by this greeny black staining, the staining from his wider ring, this indicates iron deficiency. The ring he's wearing has scratch marks from when he puts it in his pocket with coins or keys.”
“He is right handed, the callous on his right hand is from resting it on a desk using a mouse, so an office worker, but the mud on his shoes and the grit in the car, his car, means he travels. There are traces of printing ink on his wrist, from carrying freshly printed material.”
“So...a printer's sales rep, two wedding rings which he wears alternately. He has two wives, he lives a double life and lives in two places, not one. Scene of crime within 6 hours drive. Probably in the Southern Lakes National Park. Which is why I need more samples than usual.”
Satisfied that he had given a full explanation Sherlock began collecting samples.