Subsequently, Sunny (21) was arrested and his juvenile associate apprehended, they said.
On March 4, Dashrath Mukhia (35) was stabbed to death near the Yamuna Apartments in CR Park area, officials said.
Mukhia used to work as a cook in Greater Kailash-II and belonged to Madhubani, Bihar. During investigation, it was found that the accused were in the age group of 18-21, they added.
Seven teams were formed and as per the description of the accused given by eyewitnesses, a search was carried out in the jhuggi clusters of Govindpuri and Tughlakabad Extension, Deputy Commissioner of Police (South) Romil Baaniya said.
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One of the accused fell down after the collision, following which an argument broke out between Mukhia and the accused, police added.
The juvenile then caught hold of the victim and Sunny stabbed him twice in the chest, they said.
Out of 462 cases of murder reported last year, over 18 per cent of killings were over trivial issues that led to bloodshed, according to the Delhi Police.