Shamshad (20) allegedly stabbed Salauddin with a knife "more than 25 times" on November 26, while Sunil Pal (19) was an accomplice in the crime, said DCP (West) Vijay Kumar.
Salauddin's friend Monu, who had rushed him to the hospital, told the police that on the fateful day, they were consuming alcohol when the deceased got a call from Pal who told him that he had got into a brawl with the local boys at DDA Park and called him for help, said the officer.
The friends rushed Salauddin to the hospital but he was declared "brought dead".
A police team was formed to nab the accused and raids were conducted at their houses and other probable places but in vain, the officer said.
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Acting on a tip-off, the police today arrested Shamshad and Pal from near the Chander Vihar cremation ground, he added.
The girl told about this to Shamshad who helped her change her phone number and warned Salauddin against calling or meeting her, he added.
"On November 25, Shamshad met Pal at a wedding ceremony where the latter told him that Salauddin was asking for his girlfriend's mobile number. Subsequently, Shamshad arranged for a knife and hatched a plan to kill Salauddin," said Kumar.
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