The personal assistant who delivered $40,000 in cash to his boss's Washington mansion during a home invasion earlier this month in which four people were murdered allegedly lied to authorities about key details, according to court documents.

The assistant, identified by Fox affiliate WTTG as Jordan Wallace, changed details about his $40,000 delivery to the home of Savvas Savopoulos, CEO of American Iron Works, on the day the family was killed, authorities claim.

Savopoulos, 46, his wife, Amy, 47, their son, Philip, 10, and Veralicia Figueroa, 58, a housekeeper, were murdered May 14 inside the family's $4.5 million home a short distance from the vice president's residence in Northwest Washington, D.C. 

Authorities said they believe the family was held overnight, during which they were bound and tortured before being stabbed and beaten to death the following day. After $40,000 in cash was delivered to the home by Savopoulos' assistant, the mansion was set ablaze. Amy Savopoulos' Porsche was found hours later, torched in a church parking lot.

Daron Dylon Wint, 34, was arrested last week after authorities found his DNA on a discarded pizza crust in the house. Investigators have said they believe more than one person was involved.

Multiple sources told WTTG that Wallace is the so-called "W-1" -- known as Witness 1 -- in court documents, and that he lied about details surrounding the money drop-off at the Savopoulos home.

Wallace began working as Savvas Savopoulos' assistant and driver in March, according to Nelitza Gutierrez, the family's housekeeper of 20 years who was told not to show up to work the day the family was killed. 

WTTG reported that Wallace is an amateur race car driver who worked at a go-kart race track in Jessup, Md., from 2013 until March of this year. An employee at the track told the station Wallace was fired from the job. The former co-worker also said Savvas Savopoulos often brought his young son to the track, where the employee said it's believed the CEO and Wallace met.

In court documents filed last week, prosecutors said Witness 1 lied about how Savvas Savopoulos told him to collect the $40,000 in cash, how he picked up the package and where he left it at the family's home.

Police said Savvas Savopoulos made a flurry of phone calls on the morning of May 14 to his accountant, his bank and his company. A short time later, his assistant arrived at the home with a package containing $40,000 in cash and told police he knew nothing of the horror unfolding inside the home. 

Wallace allegedly told police he knew there was $40,000 in the package because another employee had told him. But police found that Wallace text messaged photos of the bundles of cash -- apparently to his girlfriend, according to WTTG.

Wallace also allegedly said that when he dropped off the money in a red car in the Savopoulos' garage, the car was locked. He later said it was not, the station reported. 

According to Wallace's social media accounts, which have since been taken down, the assistant had a fixation with the family's luxury vehicles. 

Wallace posted photos from inside the family's Porsche on his Instagram account -- with one caption reading, "My office has many leather bound seats and smells of rich mahogany!" 

"I'm driving for a CEO in D.C.," he wrote. He also posted interior shots of the couple's Bentley and Land Rover vehicles.

While prosecutors said Wint had help from at least one other person, no additional suspects have been publicly named. The investigation is ongoing and detectives are testing a fingerprint found on a water bottle inside the home, according to law enforcement sources. Authorities are also investigating the four other individuals traveling with Wint when he was apprehended May 21 in Washington after a manhunt that stretched to New York City. 

In an interview Friday with FoxNews.com, Gutierrez, the couple's housekeeper of 20 years, recounted the hours leading up to the murders and said the couple "saved me" by instructing her not to work at their home the day they were killed.

Gutierrez said she was helping Savvas Savopoulos' on May 13 at a martial arts studio he was set to open when his wife, Amy, called him at around 5:30 p.m. Savopoulos told Gutierrez his wife asked him to come home to watch the couple's son because she had plans that night. 

Gutierrez said she believes Amy Savopoulos was forced to make that phone call. Gutierrez said her friend, Veralicia Figueroa, was working for the family that day and was scheduled to leave by 3 p.m.

Later that night, Guitierrez received a voicemail from Savvas Savopoulos saying she should not report to work May 14, the following day, because his wife was sick -- even though Guitierrez normally worked Thursdays. He also said Figueroa would be staying the night and asked that Guitierrez notify her relatives to let them know because Figueroa's cell phone was dead. Guitierrez, who did not listen to the voicemail until the following morning, said she found the message strange.

"I was thinking, 'What's going on? Why is Amy sick? Why is Vera staying overnight?'" she told FoxNews.com, noting that neither she nor Figueroa slept overnight at the couple's residence.

Guitierrez said she made several attempts to reach Figueroa and Amy Savopoulos the morning they were killed. She said she later received a text message from Amy Savopoulos, saying, "I am making sure you do not come today." 

The fire was reported to authorities at approximately 1:15 p.m. on May 14. When first responders arrived, they found Savopoulos, his wife and Figueroa dead in chairs inside the master bedroom. Each had been beaten and stabbed, police said. 

Philip Savopoulos was found burned beyond recognition in another bedroom, where police say they believe the fire started. 

The Savopoulos' other two children, Abigail and Katerina, were away at separate boarding schools at the time of the murders.

Guitierrez told FoxNews.com the couple had a gun they hid inside a closet in the master bedroom and said they sometimes moved it underneath the bed so "Philip wouldn't find it." She also said the family seldom turned on their security system and often left open their garage, where Guitierrez said she believes the killer or killers entered.

"They never really had it on, especially because the house was so close to the vice president," Guitierrez said of the alarm system. 

"They were a very nice family. Amy was very sweet and very generous," she said, fighting back tears. "I'm going to miss them so much." 

FoxNews.com's Cristina Corbin contributed to this report. 

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