Las Vegas man is charged with murder after 'recording himself shooting a sleeping homeless person in "thrill killing" and opening fire on random man walking his dog'

Police in Las Vegas have arrested a man who recorded cellphone video of himself in what a homicide lieutenant called the 'thrill killing' of a sleeping homeless man and the unprovoked shooting of a man walking his dog in a park.

Noah Green, 21, of Las Vegas was being held Tuesday at the Clark County jail pending a court appearance Wednesday.

He was arrested late Friday not far from his apartment several blocks west of the Las Vegas Strip, records showed.

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Noah Green, 21, of Las Vegas, was arrested Friday on murder and attempted murder charges

Police Lt. Ray Spencer credited detectives going door-to-door with identifying Green as the suspect in the July 13 shooting death of Brent Michael Lloyd, 48, and the July 15 wounding of another man who was shot in the chest not far away. 

The wounded man's name was not made public.

'It appears that it is a thrill killing,' Spencer said of Lloyd's death.

Lloyd was shot in the head, and a jogger found his body outside an apartment complex and called 911. 

The police official told reporters Monday that Green did not interact with either victim, and Green's cellphone recordings gave him the ability to view the shootings again and again.

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Lt. Ray Spencer is pictured at a press conference in Las Vegas on Monday, detailing the arrest

'This is a homeless person who was sleeping,' Spencer said, 'and the unprovoked shooting of the man walking his dog. The videos are absolutely disturbing.'

Detectives began watching Green, and authorities tried to stop him after watching him leave his apartment and jaywalk.

According to Spencer, the surveillance team planned to stop Green if they saw him break any kind of law, believing he could be armed.

Green ran away from police but was eventually caught and taken into custody.  

Officers found the 9mm handgun in a paper bag in Green's pocket following a brief foot chase and his arrest, Spencer said, and were examining other cellphones and recording devices discovered in Green's apartment to see if they showed other crimes. 

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The scene in Las Vegas as police investigate the July 13 murder of homeless Brent Lloyd

Spencer said police were working to determine if Green has ties to any other crimes committed in the area. 

Green was being held on murder, attempted murder, concealed weapon and jaywalking charges, court and jail records showed.

A deputy public defender who represented Green on Monday was not appointed to his case and declined Tuesday to comment.