Estby also appeared as a guest singer of Entombed in 1997 during a show in Stockholm and sang "Left Hand Path".

After the release of 'The God That Never Was' and some touring, Fred Estby left the band "after long and careful consideration".

In a posting on the official site on April 20, 2007 Fred cites the demands of touring and the needs of his family as key reasons for him leaving the band.

[2] Fred's statements appears as "My decision to put my family in first hand makes it impossible to keep on touring and commit to the band full time.

In 2022, Estby joined the death metal band Ekstasis, which also includes vocalist Damien Moyal.