One of the two Washington DC snipers who killed 10 people during a 2002 crime spree has tied the knot to a 'trust fund baby' in a jailhouse ceremony.

Lee Boyd Malvo, 35, married wealthy Sable Noel Knapp, 30, inside Virginia's Red Onion State Prison on March 6, according to The Daily Beast.

Knapp is the granddaughter of a wealthy Iowa real estate developer. She is also an outspoken activist who has donated hundred of thousands of dollars to left-wing causes.

Malvo made international headlines 18 years ago, when he and John Allen Muhammad, 41, were arrested for the random shooting of ten people in and around the nation's capital.

Malvo was just 17 years old at the time, and received eight life sentences for the crime spree. His attorneys claim the teen was 'brainwashed' into taking part in the sniping murders by his much-older accomplice, who was executed in jail in 2009.

The incarcerated Malvo connected with heiress Knapp back in 2018, when she first wrote to him in prison. The pair started meeting a short time later.

Meanwhile, Knapp also has a previous criminal conviction. She was arrested back in 2016 for blocking a roadway during a Black Lives Matter protest in Portland, Oregon.

Washington DC sniper Lee Boyd Malvo, 35, married wealthy Sable Noel Knapp, 30, inside Virginia's Red Onion State Prison on March 6. Malvo (left) is serving eight life sentences. Knapp (right) is a wealthy activist who is pictured following her arrest during a 2016 Black Lives Matter protest

Malvo was just 17 years old when he went on his three-week sniping spree in 2002, alongside John Allen Muhammad. One of the crime scenes is pictured

Malvo's attorneys claim the teen was 'brainwashed' into taking part in the sniping murders by his much-older accomplice, who was executed in jail in 2009

The lawyer who represented Knapp during that arrest told The Daily Beast that Knapp is 'really committed to social activism, for sure, and I think she was always looking for ways to make changes'.

The wealthy activist has also put her money where her mouth is, donating $106,250 to left-wing Cathy Glasson when she was running for Governor of Iowa in 2017.

Knapp has also having given 'thousands of dollars' to both Bernie Sanders and Marianne Williamson.

In a post penned last September, Knapp wrote: 'Marianne Williamson is by far the most qualified presidential candidate to guide us in developing the insight and emotional resilience we need in America to build a truly beautiful future together'.

Knapp has also having given 'thousands of dollars' to both Bernie Sanders and Marianne Williamson. She is pictured with Williamson last October

Knapp has also co-authored a book titled You Are The Change: A Beginner's Guide to Socially Responsible Investing.

She has additionally written multiple blog posts, with titles that include: 'Expand Personal Compassion To Break Cycle Of Violence Caused By Division' and 'Water is Our Shared Lifeblood'.

Knapp's wealthy family have not made public comment on her wedding to serial killer Malvo.

Her developer grandfather is still alive, but her father - who was a professional tennis player - passed away in 2008.

However, one of Knapp's mentors was present for the wedding ceremony.

Malvo is pictured in court in Octover 2003. He has been served eight life sentences without the chance of parole

'It was a wonderful occasion and I'm very happy for the couple,' they told The Daily Beast.

'They seem to be soul mates and they're very happy they found each other'.

There has been no comment from the families of the 10 victims of the 2002 DC sniper attacks.