Fans of the South Korean singer Kim Jong-hyun were in mourning on Tuesday, a day after he killed himself and left behind a note that said he was overcome by depression, South Korea’s Yonhap News Agency reported.

Fans of the singer, who was 27 and known by his stage name Jonghyun, flocked to pay their respects or set up vigils on outside of Asan Medical Center in Seoul, where he was taken to the hospital on Monday and pronounced dead, the news agency reported.

The police in Gangnam, where Mr. Kim’s body was discovered by his sister in an apartment, said there would be no autopsy because it seemed “clear that the deceased took his own life.”

Yonhap reported that the singer had sent a text message to his sister saying, “Please let me go. Tell me I did well” and “final farewell.” It also quoted an Instagram post from Jang Hee-yeon, a friend and the lead singer of the rock group Dear Cloud, that said Jonghyun had written to her about his struggles with depression.