1. Maj O'Donovan served with the 31st Infantry Regiment in the Philippines. He was taken prisoner by the Japanese after the fall of Bataan in April 1942 and died at the Cabanatuan POW camp in October 1942 from beriberi and other illnesses. 

2. Maj O'Donovan was initially listed as Missing in Action, then later reported as a POW. In 1952, 10 years after his death, his wife was informed his remains were non-recoverable. This was despite evidence he was buried in a marked individual grave at Cabanatuan which was later disinterred.

3. In February 2018, after discovering the DPAA was using DNA to identify unknown remains, the family submitted DNA reference samples to aid in potentially identifying Maj O'Donovan's remains.

4. In August 2019, the family was notified the DPAA had approved the disinterment of Unknown X-1350 from the Manila American Cemetery, which historical records indicated may be associated with Maj O'Donovan. 

5. Historical records show Maj O'Donovan was buried in an individual grave (Grave 649) at Cabanatuan that was later moved to the Manila cemetery as Unknown X-1350. This reduces the likelihood of his remains being commingled, a positive sign for identification. However, DPAA cautioned that some single graves did prove to hold multiple individuals.

6. In January 2020, the family was informed X-1350 had been disinterred in late 2019 as part of a group disinterment project for Cabanatuan unknowns. The remains are now at the DPAA laboratory in Hawaii undergoing analysis, including DNA testing, to establish identification. This process is expected to take anywhere from several months to 2 years. It has now been 5.5 years with no resolution in sight.

7. Overall, while the identification process is lengthy, the DPAA's decision to exhume X-1350 and their ongoing analysis is a major step forward in potentially identifying and repatriating Maj O'Donovan's remains. The dedication of the family in providing DNA samples and historical information has been instrumental in moving his case forward after so many decades.

This summary is a consolidation of the key details about Maj O'Donovan's case based on the information available. The family maintains hope of bringing this long-missing hero home.