Wichita Falls police say a second suspect surrendered just after 3 this afternoon.
Nineteen-year-old Michael Shay Graves is charged with capital murder.
Police had earlier issued a warrant on a parole violation and said Graves might have information about the murder.
The other suspect police believe was involved in Monday's fatal shooting of Muhammad "Mo" Ahmad, the owner of "Mo's Grocery" on Iowa Park Road, was charged yesterday.
Seventeen-year-old Clifton John Russell IV is also charged with capital murder.
According to affidavits, Russell was watching the news with his family when family members recognized him in the surveillance video from the store.
An arrest affidavit states that's when Russell admitted to being there and to shooting "Mo" Ahmad.
Russell is being held in the Wichita County Jail on a $1.5 million dollar bond for capital murder.
Surveillance video shows two suspects entering Mo's Grocery, and one man points what appears to be a gun at Muhammad Ahmad.
Police say Ahmad was shot once in the chest.
He was rushed to the hospital, but died from his injuries.
Customers and friends say the man they called Mo was a kind and generous soul who helped everyone.
Police continue to ask for the public's help in this captial murder case.
They say some investigators work 20 hour days searching for the suspects and following up on leads.
If you have any information that can help them, even the smallest detail, call Crime Stoppers at 322-9888.