A 17-year-old boy and his 16-year-old girlfriend were detained for allegedly killing a septuagenarian in Palghar district, a police official said on Monday, reported news agency PTI.

The official said 75-year-old Kishore Brijmohan Mishra, a vendor residing in Naigaon East, had gone missing on February 15, after which two teams were formed to trace him.