New Delhi: The Central Bureau of Investigation (CBI) Friday arrested Raj Kumar, the servant of a doctor friend of dentist Rajesh Talwar who has been jailed for the alleged murder of his teenaged daughter Aarushi and her family's domestic help. His blood-stained bicycle was also seized.

Raj Kumar, who worked for Anita Durani, also a dentist, was arrested after the CBI recovered a blood-stained T-shirt from the room he lived in.

This is the third arrest in the case, which continues to hog the headlines and choke the airwaves a month-and-half after the sensational double murders in the upscale Jal Vayu Vihar neighbourhood in suburban Noida.

"Raj Kumar was detained for interrogation but he was arrested today (Friday) after forensic examination confirmed that the T-shirt (that was recovered June 13) had blood stains of human origin," CBI joint director Arun Kumar told reporters here.

These stains, according to a DNA report, are not of Raj Kumar's, and will now be matched with those picked up from the crime scene to see whether they match with any of the victims.

CBI officials seized Raj Kumar's bicycle too Friday after blood stains were found on it.