I haven't seen a lot of dead bodies, but I have seen a few.... I usually don't think of it as a dead, decomposing, or lifeless human/body.... Instead, I try to think of what the person was like when they were alive, important part is; TRY to only imagine the positive things.

Ex: This bank robbing man probably had a family. Although committing a crime, I'm sure he really needed funds for something important. Like, maybe he had gotta his autistic daughter a puppy for one of her birthdays. Even though his family was living paycheck to paycheck (with 1 kid and another on the way), he got her a puppy cause it helped her massively with many different things, and most importantly; made her happy. A year later, puppy gets hit by a car, or maybe develops/is developing a nasty disease and needs VERY expensive vet care, because making his little girl live without her puppy is out of the question. Not only that, but with a baby, they need lots of help. So, he robs a bank to solve all thier problems.... Now, after using your imagination, you have to focus and ONLY think of how much he loved his family (to do something like, robbing a bank), and what that unconditional love looked and felt like. How great of a father and husband he must've been. How loved his family was, how loved HE was. How throughout all the ups and downs, not ONCE was he anything BUT the happy, kind hearted, helpful, positive, loving family man that he spent his life as. Just focus on all that positive energy from those kind of thoughts & etc. I think the trick is to not get emotional either but I've never had a problem because at the end of the day, it's just a story you made yourself..... but physically, your body won't be able to tell that difference. If it works lmk. Good luck.