My father is depressed?

Hello, my mom died about a year ago and everything was ok. a couple months down the road he started getting upset over small things and accuse us and my siblings when we did nothing wrong or try to help I’m. i can’t talk to him anymore when I do besides work he starts arguing for no reason out the blue , or find something to fight about. it’s been really bothering me for months also he just talks about the same thing like killing or death. or disease. that’s how my mom passed with diseases. I don't know what to do. he is a different person he even stop talking to a lot of his family for no reason. i understand he is sad but he likes to put it out on people and it’s making me upset he is also very controlling and complain heck of a lot. Whatever that doesn’t deal with his work he blows up. seems like I can’t move on with my life. There is a deeper issue I wanted to ask have you guys ever dealt this with a parent who lost a spouse , is this normal? deep down I know there is a psychological issue because it doesn’t make sense to constantly be upset after a year

My father is depressed?
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