Shelley "Kat" Martin, 62, was charged with murder over the death of 40-year-old Emilio Ghanem, who vanished in 2023. Martin and her husband, Darryl Martin, were also charged with murder over the death of 4-year-old Timothy Thomas in 2010.
Intentionally aiding a person to enter the country illegally carries a penalty of six months to two years' imprisonment and a minimum of three strokes of the cane.
Offences involving the organisation of public assemblies or processions without the required permit, or in breach of permit conditions, carry a fine of up to S$5,000.
Sydnee Graf, 36, was arrested over explicit conversations she had with a student under 12 years of age, during which she allegedly discussed oral sex with the boy.
Sajid and his son, Naveed, 24, are suspected of having carried out the attack during a Hanukkah celebration on Sunday, killing 15 people and leaving dozens of others injured.
Their daughter Romy, 27, who lives across the street, then went to check on them herself and called emergency services after discovering a horrifying scene inside the home.