Two juvenile accused have already been arrested in connection with the murder of the property dealer Pratap, police said.
The main accused, Randhir, who was absconding after murder of Pratap, was arrested near GTK bypass bus stand, last evening, said Amrutha Guguloth, Additional DCP (North West) district police.
A reward of Rs 20,000 was announced by Commissioner of Police on his arrest.
An FIR was registered in connection with missing Pratap at Rani Bagh police station, on the complaint of his mother on June 30, 2014.
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On July 6, police apprehended two juveniles on a tip off, who admitted killing Pratap at his office in connivance with Randhir, she said.
They also admitted throwing Pratap's body in gutter in Mangolpuri area. The body was recovered from the gutter.
Randhir had been hiding at Rudrapur and Haridwar in Uttrakhand to avoid arrest.
"At the instance of Randhir the transaction register with victim Partap has been recovered from his house. Five days police custody remand has been obtained for recovery of weapon of offence and CCTV footage of the crime scene," added the officer.