Tatul Krpeyan was born on 21 April 1965 in the village of Areg in Talin District (now Tatul, Aragatsotn Region), Armenia. In 1984-1985, he served in the USSR Armed Forces. In 1987-1990, Krpeyan studied at the Yerevan State University, Department of History. In 1987, he joined the Miatsum organisation. In September 1990, he began working as a history and geography teacher in the schools of. He was the organiser and general commander of the Getashen-Martunashen area self-defence forces between September 1990 and April 1991.
In April 1991, during the Koltso operation, jointly perpetrated by the Soviet troops and Azeri special police with a purpose to forcefully deport the Armenian population from the Getashen district, Tatul took hostage Colonel Maskhov, the commander of the USSR Internal Forces Baku Regiment along with 17 Soviet officers and Azeri special police. Krpeyan was killed on 30 April 1991 during the negotiations in Getashen. ARF member (1990).
Several schools, such as High School No. 62 in Yerevan, the school in the village of Tatul, and the school in the village of Kovsakan, Kashatagh region, NKR), as well as a street in Talin, an auditorium in the Department of History at the Yerevan State University, classrooms in Yerevan, Gyumri, Ararat Region, a park in Yerevan (First District of Nor Nork), a number of ARF organisations were named after Tatul Krpeyan. A Tatul Krpeyan scholarship was established at the Yerevan state University. His poetry brochure titled "Tatul" was published in 1993. A historiography book "Tatul Krpeyan: The Self-defence of Northern Artsakh Getashen District", authored by I. Barseghyan-Krpeyan, was published in 2016. He was buried in the village of Tatul, where his tufa stone monument has been erected. National Hero of Armenia (posthumous, 20 September 1996). Awarded the highest Hayrenik Order of the Republic of Armenia (20.09.1996, posthumously).