Marrayya Monica Susayraj (27), the actress and her boyfriend of over 18 months, Lt M L Jerome Mathew (25) were produced before the Borovili court on Thursday.
The court remanded the duo to police custody upto May 29. Matthew was brought here from Kochi by the police.
Joint Commissioner of Police (Crime) Rakesh Maria had on Wednesday said that the murder of 25-year-old Neeraj Grover was fallout of a love triangle.
Grover, creative head of Synergy Adlabs, was missing since May seven.
Marrayya, who has acted in four Kannada films, came to Mumbai in March trying to get into Hindi serials and had also auditioned for the newer version of Mahabharata. She came in contact with Grover while applying for work and both started "going around", to which Matthew had objected, police said.
On May seven, Mathew took a flight out of Kochi where he is based and reached Marrayya's place at 0730 hours the next morning, where Grover was already present. An altercation ensued between Mathew and Grover which ended with the latter being allegedly stabbed to death by the naval officer.
Marrayya went to a nearby mall and made a host of purchases which included a few knives, curtain cloth, bed linen and sports bag. "The couple chopped off the body into pieces, replaced the blood-stained pieces of cloth and packed the body into the bags," Maria had said.