In class writing

I am a detective who is trying to find the killer who accidentally killed my sister, and the killer is also my sister's husband. In this situation, I see he puts the gun to himself to try to suicide, and I don't want him to get hurt, so I tried to convince him by putting my weapon down and talking so peacefully. I also want to stop him, so I walk slowly toward him during the coversation, and finally I hold his gun down. However, he doesn't want to live anymore, and he also thinks that I don't really care about my sister and him because I act so peaceful and emotionless, so he shoot me and then suicide.