After retiring from the army, he served as Myanmar's ambassador to Sri Lanka, Bangladesh, Maldives and South Africa.
[3] On 24 September 2022, he was shot dead, along with his son-in-law Ye Tayza, a former army captain, by anti-regime urban guerrilla fighters in Yangon, becoming the highest-ranking junta target killed by resistance groups.
He was accused of supporting the junta and encouraging the military to kill people who were against the coup.
[4][5] The military council announced in October that it had arrested 10 individuals responsible for Ohn Thwin's death.
[6] The military council has condemned the assassination, calling it a deliberate killing of veterans.