PHOENIX -- John Allen Muhammad, the mastermind of the 2002 Washington, D. C., area sniper shootings, is scheduled to die by injection at the Virginia prison Tuesday.

Attorneys for Muhammad asked the nation’s highest court last week to stop the execution, but the U.S. Supreme Court refused to block Tuesday's scheduled execution. The court did not comment on why it refused to consider the appeal.

Arizonan Cheryll Witz traveled to Virginia to witness the execution.

Witz’s father, Jerry Taylor, was the Tucson man gunned down on a golf course in 2002, a few months before the Washington, D. C. area attacks.

Muhammad’s teenage accomplice, Lee Boyd Malvo, confessed the pair was responsible for shooting Taylor, according to Tucson police.

Witz said she never wavered in her decision to witness the execution of Muhammad.

"He took part in watching my dad die, and I want to watch him die. That's justice to me,” said Witz. ”My dad was everything. He was wonderful.”

Taylor's death had not been conclusively tied to Muhammad and Malvo until Witz wrote Malvo a 5-page letter, begging him to confess if he was responsible.

"I wrote a letter to him asking him to come clean. I believed that he was the one who killed my father, and (told him) that I really needed a confession to have closure, to have some peace," said Witz.

Witz said she needed to forgive Malvo, who was only a teenager when the sniper shootings terrorized the Washington, D. C., region.

“He was brainwashed. I truly believe he was brainwashed. He had no family. He had no mother," said Witz.

Witz, however, does not forgive Muhammad.

"I would love in my heart for him to say, ‘I'm sorry,’ to all the families. But knowing him, he's not going to do that," said Witz.

When asked how she chooses to remember her father, Witz talked about his kindness and generosity. She also shared one very simple memory.

"The first thought I have when I think of my dad is always how he had his keys and his change in his pocket, and he'd jump around at the kids and the dog to get the dog barking,” said Witz. “I miss that because he always had his keys and his change in his pocket, and so you could always hear that when he walked. Cling, cling, cling, cling."