Authorities have yet to confirm the motive for the killing, although it was previously reported that police suspect there might have been an “economic” motive.
Ms Fang’s family discovered last month that she had bought insurance policies from her suspected killer in 2015.
They came across two investment-linked policies from insurer AIA that were sold by an agent named Ong Cheong Yi, which is Mitchell Ong’s Chinese name.
Marriage registration records in Singapore show that the suspect got married in June 2012 under the name Ong Cheong Yi.
Spanish police are also looking into a Central Provident Fund (CPF) nomination note that was found on her iPad.
The note, dated Mar 24, stated that Ms Fang had decided to nominate an unknown person for her CPF money because the person was her “long-time friend and trusted confidant”.
It also mentioned a loan of US$50,000 (S$68,000) that was provided to Ms Fang due to their past friendship.
CPF is a mandatory social security savings scheme that is funded by contributions from employers and employees. In the event of the person’s death, these savings are given to the person’s nominee or nominees.
If no nomination is made, the money will be handed to the Public Trustee’s Office to be distributed to family members.
Her family said they would check with Singapore authorities if Ong had been made a beneficiary of her insurance policies or her CPF money.
Spanish police are also investigating if Ms Fang might have met Ong on an online dating app.
