Siti Aisyah, an Indonesian, and Doan Thi Huong from Vietnam, were detained after closed circuit television showed them accosting Kim Jong Nam at Kuala Lumpur International Airport on February 13.
Malaysia's Attorney General Mohamed Apandi Ali told CNN the women will be officially charged on Wednesday. Intentional murder is punishable by a mandatory death sentence in Malaysia.
Aisyah has denied she killed Kim on purpose, telling Indonesian officials she believed she was working on a prank show and was smearing Kim's face with baby oil.
Criminal and constitutional lawyer Syahredzan Johan told CNN he expects both suspects will enter their pleas on Wednesday and there could be a trial within two months, due to the international attention.
North Korean diplomats arrive
A high-level delegation from North Korea arrived in Malaysia on Tuesday as Kim's murder continues to cause diplomatic tensions between the two countries.
Malaysia has refused to release the body of Kim, who South Korean intelligence claims was killed on the direct orders of the North Korean leader.
After arriving in the Malaysian capital, former North Korean Deputy UN ambassador Ri Tong Il said the delegation had come to negotiate the return of the body.
He said they would discuss the "question of the release of the DPRK citizen arrested by Malaysian police related to the above incident, (and) the development of friendly relations between DPRK and the Malaysian government."
Malaysian authorities have requested a DNA sample from the victim's next of kin before they will release the body.