According to Mainichi news, Tobe Keiko, the author of manga With the Light: Raising an Autistic Child passed away on January 28th. She was 52. The serialization of "With the Light (Hikari to Tomoni)" had been suspended since January 2009 due to the illness of the author.

Keiko Tobe, the creator of the With the Light manga, passed away on Thursday. She was 52. A private service will be held for close family members only.

In the story of With the Light which she launched in 2001, Tobe dealt with a mother's struggles to raise an autistic son. In 2004, the manga won an Excellence Prize in the Japan Media Arts Festival Awards from the Japanese government's Ministry of Cultural Affairs. The manga had been on hiatus since January of last year due to Tobe's unspecified illness.
Source: Mainichi Shimbun and AnimeNewsNetwork