My friend's mother died of illness and could not be present.

My friend's mother died of illness and could not be present, as follows:

1, I'm sorry I can't attend in person, and I'm deeply saddened by the death of your friend's mother.

Although I can't attend, I sincerely mourn the death of his mother with your friend.

Although I can't spend this difficult time with your friend in person, I am deeply concerned about your mother's death and extend my deepest condolences to her.