I'm with those like Jaraxle ^^^ questioning it being suicide. Sounds more like homicide to me too.
I also side with those who would remind folks not to judge someone who does this. Many people call those who commit suicide selfish and the like and I don't agree with that. They have to be in unbearable pain( physical and/or emotional )to kill themselves. I would never judge someone who did that but rather I would try and understand why and feel sorrow and pity for them.
Like so many others who have posted I know of some instances of suicide that hit my circle of family and friends( I actually worked on a remodel following a family friend using a shotgun in the basement to end pain from illness - was not a fun job ). It is extremely hard on the friends and family left behind and they also have my sorrow and sympathy.
For some there is nothing, be it medicine or therapy, that can help them and only suicide offers any relief. I don't judge those people as said. I just try and understand why they did it and feel sorry for them.
Maybe having a disease like MS, and knowing what could happen to me in addition to what already has, it let's me see/understand the other side a little better? Now, obviously I am not saying it's okay to off yourself over a parking ticket. But for so many there is NO reason no matter what it is that makes it understandable and that is where I disagree.
Sometimes I think the family and friends wanting the person to stay at all costs( i.e.; machines, in serious pain, no quality of life, etc... )so THEY don't suffer grief over a loss are the selfish ones. They only think about their pain and not what the person is going through. Sometimes I think we as a society treat our pets with more compassion and dignity when it comes to end of life than we do humans.
I read the OP's story and I think if it was suicide what drove the poor man to it? Was he sick and either going to die in agony or was already in pan and just hadn't told his family, was he suffering some type of mental illness and losing the battle, etc...? What demons was he facing that drove him to it? I also think about his poor family and friends who are grieving. My 1st thought isn't he was selfish.