Eleven years after the death of Tupac Shakur, Las Vegas investigators are heading to Los Angeles to see if any questions can be answered regarding the 1996 shooting.

Possibly brought on by allegations in the documentary Tupac Assassination: Conspiracy Of Revenge, which was released in October, investigators are once again looking for clues and possible answers from Marion 'Suge' Knight and Reginald Wright Jr, both of whom are maintaining their innocence.

"God knows the truth and when it comes down to it, it's not one person in the world with any sense to know I had anything to do with getting Tupac shot," Suge Knight told Los Angeles' Fox 11 News.

Until recently, the death of Tupac was considered a cold case.

According to Tupac's former bodyguard and undercover FBI agent, Kevin Hackie, there are several major factors that point to Knight and Wright's guilt in Tupac's death.

Hackie maintains that on the night of Tupac's death two dozen of Tupac's bodyguards were told not to carry weapons.

Hackie also believes that the infamous fight at the MGM Grand Hotel involving Crip gang member Orlando "Baby Lane" Anderson was staged, so that that the rival would receive the blame for Tupac's death.

Hackie also claims that prior to Tupac's death at a concert at the House of Blues, a .40 caliber Glock handgun was confiscated from a member of Tupac's entourage and given to Hackie who in turn returned the gun to Wright.

A .40 caliber Glock handgun was used to kill Tupac and Hackie believes this was the exact same gun confiscated at the House of Blues, prior to Tupac’s September 1996 slaying.

Earlier this month, Hackie put out a $100,000 challenge, challenging Wright to take a polygraph test with plans to give Wright the $100,000 if he passed.

Wright has vehemently denied any allegations involving the death of Tupac Shakur and has agreed to take the polygraph test.