The death of 21-year-old Askia Khafra in a Bethesda home last fall was tragic and bizarre. Hired to help dig a network of secret tunnels leading from the basement, Khafra burned to death when a fire broke out.

Now, according to authorities, his death amounts to something else as well: an act of “depraved-heart” murder, committed by the man who supervised him.

Daniel Beckwitt, 27, who lived at the home, created conditions that posed a huge risk to Khafra, authorities said in court papers, acting in what the law defines as “extreme disregard” of the young man’s life. Depraved-heart murder — one step below premeditated, first-degree murder — is punishable by up to 30 years in prison.

Beckwitt is expected to make his first court appearance as soon as this week before a judge in Montgomery County, Md. He was arrested Friday in Fairfax County, Va., and has been held there.

New details in the case are spelled out in an affidavit that Montgomery detectives filed to secure charges against Beckwitt. The document describes the extent of the tunnel complex, which was at least 20 feet below the surface and approximately 200 feet in length.

Still a mystery is why Beckwitt wanted the tunnels and how he intended to use them. But the affidavit describes efforts Beckwitt took to keep his project secret.

He allegedly took a rental car to pick up Khafra at his home in Silver Spring, Md., drove him to Manassas, Va., had him put on “darkened, blackout glasses” that kept him from seeing and told him he was taking him to a job site in Virginia. Instead, according to detectives, Beckwitt drove Khafra to his home in Bethesda, Md., led him to the basement and only then allowed him to remove the blackout glasses.

Police also charged Beckwitt with involuntary manslaughter, a lesser crime that carries a sentence of 10 years, court records state.

Robert Bonsib, an attorney for Beckwitt, questioned the strength of the case.

“The charge of depraved-heart murder under these circumstances is a novel and misguided legal theory,” he said. “We do not believe that either that charge or the charge of involuntary manslaughter will be supported by the facts in this case. We look forward to the opportunity to fight these charges in court.”

According to the affidavit in the criminal case, Montgomery firefighters and police officers went to the Bethesda home at 4:23 p.m. on Sept. 10 in response to a call about a house fire. They found fire in the basement and Beckwitt outside the home. He told them that someone was in the basement.

It was there, according to the affidavit, that investigators found Khafra’s body.

“Fire investigators discovered a hole in the concrete basement floor, which led to an underground tunnel complex underneath the basement,” Montgomery detective Michele Smith wrote in the affidavit signed May 25. “The entrance shaft dropped down approximately 20 feet, where the tunnels branched out approximately 200 feet in length.”

Detectives spoke with Beckwitt, who told them about renting a car, picking up Khafra in Silver Spring and taking him back to Bethesda via the circuitous route through Virginia.

According to the affidavit, detectives based the charge of depraved-heart murder largely on two significant conditions in the house. The first involved “hoarding” conditions that would have made it difficult for anyone to escape quickly.

Smith wrote that investigators found “immense piles of garbage and discarded items strewn throughout the entire home.” She wrote of “narrow, maze-like pathways throughout, which significantly prevented normal ease of movement within the home.”

Authorities also alleged that the tunnel complex required “substantial electrical needs” that “were served by a haphazard, daisy-chain of extension cords and plug extenders that created a substantial risk of fire.”

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