The body of Devi Dayal, with head injuries inflicted by a blunt object, was found on Sunday at Bal Convent Public School in Seemapuri.
An empty liquor bottle, two glasses and food were also found lying nearby the body, police had said, adding there were no signs of forced entry.
Dayal worked in the accounts unit of a transporter, and stayed in the school as a guard at night.
During the analysis of call records details of the deceased, the mobile number of a woman was found, said Nupur Prasad, Deputy Commissioner of Police (Shahdara).
Sajid had objections with Dayal being in touch with the woman and along with the woman, he hatched a plan to kill Dayal and rob his money also, the officer added.
On March 3, after the woman received a call from Dayal to come and meet him, she informed Sajid who also accompanied her to the school.
When Dayal was retiring for the night after having drinks, Sajid came and hit him hard on the head and also slit his wrist, Prasad said.
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