Dominic Dim, a member of the Dinka group from the Bahr el Ghazal region was born in a remote village called Adol in Twic County, Warrap State, Southern Sudan.

Dominic Dim Deng was among the Anya Nya officers of the NPG who accepted joining Gen Joseph Lagu's SSLM in 1970.

Unaware of the cease-fire that preceded the Addis Ababa Agreement, Lt Dominic Dim Deng a committed guerilla fighter was found by Anya Nya units as he was setting demolitions.

By this time Dominic Dim Deng was secretly and actively involved in an underground movement of nationalist military officers who opposed the integration and transfer of former Anya Nya forces to the North.

He led the SPLA forces that defeated SAF's Saif el Ubour and commanded the Intifada Battalion, which fought around Rumbek.

Dominic Dim Deng was appointed deputy chief of staff to Cdr William Nyuon and took part in the Western Equatoria campaign.

Dominic Dim Deng returned from the U.K in 1992, he was posted in Torit, the SPLA forces under his command repulsed the enemy in eastern Equatoria.

General Dominic Dim Deng's first task was to lay the ground work for transforming the SPLA from a guerrilla movement into a professional army.

General Dominic Dim Deng was killed in a plane crash near Rumbek with all other passengers, including his wife Josephine Apieu Jenaro Aken and Dr. Justin Yac Arop.

General Dominic Dim Deng was buried alongside his wife in Bilpam, the Sudan People's Liberation Army Headquarters in Juba on 2 May 2008.