The wife of a B-52 bomber crew member who died in a horror crash at a California air base revealed he made an ominous warning about their aircraft just days before the tragedy. 

Lauren Smith, the widow of Defense Department contractor Jeromy Smith, said her husband's plane was experiencing technical issues two days before the aircraft crashed on Monday. 

The bomber went down shortly after takeoff Edwards Air Force Base in Southern California and killed all eight people on board, and authorities said the exact cause of the wreck remains under investigation. 

But Lauren told KTLA that her husband knew the aircraft was malfunctioning on the Friday before the crash, as he told her 'something was wrong with the plane.' 

'I don’t know what was wrong, but the flight kept getting pushed back,' she said.

'He was supposed to fly in the morning and then it got pushed back to noon and then it got pushed back to 2 o’clock. And then they said they’re going to have to fix whatever was wrong with it and that they would fly when it was done.' 

Authorities said the eight victims on board were a mix of military personnel, government contractors with Boeing, and officials who joined a test mission, which was related to a radar modernization program. 

Smith was an engineer with the Defense Department who was contracted with the US Air Force base, and he had recently welcomed a second child with his wife. 

Four of the deceased have not yet been publicly identified, with officials naming the other identified victims as Lt. Col. Greg Watson, Lt. Col. Gabriel Estrella, and Lt. Col. Miles Middleton. 

In a GoFundMe set up to help Smith's widow, his loved ones said they have been left devastated by his sudden death. 

They said Lauren is now left to raise their two young sons on a teacher's salary, and they had recently purchased a home together. 

'The sudden loss has left Lauren facing unimaginable grief and uncertainty, as she tries to navigate life for herself and her children,' the fundraiser read.

'The family had just purchased their home together, and now Lauren is left to manage everything on her own, while caring for her two young boys.'

Smith's father Jason described him as a 'dedicated American' in a touching tribute, writing: 'You are gone, but will live in our hearts forever. Working for the DOD and giving back to his country was a big part of what Jeromy loved about life.

'I know you are in Heaven, you reached the top doing what you always loved to do. Goodbye, son.'

Middleton was identified through a GoFundMe page set up for his wife and children, which said they are now 'facing an unimaginable loss' after the plane crash. 

The Air Force Lt. Col. was remembered as a 'highly respected and experienced pilot' by the aviation community, with Facebook group Aviation 24/7 noting he previously led the 419th Flight Test Squadron.

Middleton was the highest ranking airman on board the aircraft, and officials said he was a decorated test pilot of some of the Air Force's most powerful jets. 

Family friend Melissa Lynch appealed for help for Middleton's widow Pam to support their family without him.

'With Miles gone, Pam is now responsible for supporting her family on her own,' she wrote.

Watson was also remembered by the group as a 'deeply respected leader' in the Air Force, who previously served as the commander of the 343rd Bomb Squadron out of Barksdale Air Force Base.

He was described in tributes as an 'exceptional mentor and a true professional' who 'dedicated his life to aviation and his country.' 

Estrella was a Weapons Systems Officer, who was remembered as a devoted husband and father who 'died doing what he loved', per KTBS. 

His wife Brianna wrote on social media that he 'woke up every day excited to go to work', and said he was elated to have been asked to join Monday's flight before the tragedy. 

'He told me, ‘It’s a once in a lifetime flight, babe,'' she recalled. 

The Air Force is continuing to investigate the causes of the crash, and officials said a final report may take months to complete. 

Colonel James Hayes, deputy commander of the 412th Test Wing at Edwards, said the 'routine test flight' was assessing Radar Modernization Program upgrades, which were installed starting in December.

The upgrade was part of a program to extend the life of the decades-old B-52 long-range bombers to the 2050s.

An anonymous air force member posted on a military social media group claiming maintenance crews were under 'intense pressure' to upgrade the planes faster 'at all costs'.

'Once a month they grill the Wing Commanders and entire B-52 sustainment enterprise for hours questioning why they have not yet achieved the target MC rate and what steps we are taking at the unit level to make it happen,' they wrote.

'My heart goes out to all those affected by today's crash. I hope the culture in the command soon shifts from chasing unrealistic MC targets to focusing on safety and compliance for both our maintenance and flying operations.'