Sakshi was shot dead by Subhash, a distant relative of the victim, in her Munirka house yesterday. Subhash, the cousin of victim's sister-in-law, was arrested from Ghitoli village in UP's Bagpat district last night.
The victim, who was awaiting Class XII result, had known Subhash for quite a while but had started to ignore him after she came to know that he had left school in Class VIII and worked as a sweeper in Loni near Gaziabad.
"This denial enraged Subhash and he became revengeful towards her," said B S Jaiswal, Deputy Commissioner of Police (South).
With vengeance on his mind, Jaiswal claimed, Subhash reached Sakshi's house knowing that her parents will be out for work at that time.
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"When he questioned Sakshi about her behaviour, she counter-questioned him as to why he had come to her place and objected to it. This made him angrier and he shot her," he said.
A pistol believed to be used in the murder, blood stained cloths and a mobile phone was recovered from him, the police said.