[1] Klein was killed in the Battle of Bint Jbeil after jumping on a grenade to save his fellow soldiers.

[2] His father's side originated from Germany and fled to Israel at the onset of World War II.

[4] After his discharge, Klein returned to the mechina, where he devoted himself to Torah study for a year, then went on a two-month tour of Africa.

[4] In 2002, Klein met his future wife Sarah, originally from Denmark, through mutual friends, and married shortly after.

The couple moved to the West Bank and built a home in the Israeli outpost of Hayovel, near the settlement of Eli.

[5][4] That same year, Klein began to study for a degree in Industrial Engineering and Management as part of a special program for military personnel, in which the army would pay for his tuition.

Despite having been accepted into the Technion, one of Israel's most prestigious universities, Klein instead chose to study at the Ariel University Center of Samaria in the West Bank settlement of Ariel so he could continue to live in Hayovel and pursue religious studies at the kollel in Eli.

He excelled in his engineering studies, and qualified for the honors' scholarship every year, meaning the army did not need to pay his tuition.

[4] In 2006, Klein was appointed deputy commander of the 51st Battalion of the Golani Brigade, a position he held at the time of his death.

[1][2] In July 2009, the Israel High Court of Justice ordered Israeli Civil Administration to check the legal status of Klein's home, where his family was still residing.