Prof X that is scary/weird.
The few days before my brother died, he was a true t-man, quite the large guy, and afraid of nothing. He and my sister were sitting in the kitchen and she said he startled and turned white. She asked, "what's wrong?" He told her he saw the reflection of a man wearing shorts walking behind him, he turned around and looked, and the man disappeared into the hallway. He was so afraid, that he went into his room and laid down, and my sister thought it was so freaky that he was so terrified- he never ever did this ever in our lives. My sister wanted to get a clergyman to the house, thinking it was haunted.
That same day, my brother was having some weird pains in his left arm, but refused to go to the doctor, saying he would just massage it. My sister was still upset because she and my brother were saying they felt the presence of that man in the house.
A couple days later, my brother died. Weird. A few weeks after he died, we suddenly remembered about the presence/entity or person in the house. The entity and feeling of presence were not in the house anymore.
My mom had my brother when she was very young, and my grandfather and grandmother adopted him, but we all lived together growing up, so he was raised by my grandparents and my parents (sorry if this sounds weird, it's one of those cultural things). We wondered if it was grandpa. The night my brother died, I had a weird dream that my grandmother and some angel came and met him where he died on the beach, and that "dream" never left me.