At least six MPs have asked DCI George Kinoti and DPP Noordin Haji to speed up investigations into the murder of Sharon Otieno.
They spoke on Monday at Kerugoya stadium when Kirinyaga woman rep Wangui Ngirici issued sanitary towels to school girls in her constituency.
Ngirici also launched an initiative dubbed boy and girl empowerment on Monday.
Bungoma woman rep Catherine Wambilyianga said the main suspects in the murder should now be in custody.
"We are asking Kinoti and Haji to bring to book the main killers despite their position," she said.
Sharon was abducted on Monday alongside Nation journalist Barack Oduor from a hotel in Rongo.
The journalist, however, managed to escape by jumping out of the moving vehicle and seeking help.
Migori governor Okoth Obado is being grilled by Nyanza regional DCI officers over the murder of university student Sharon Otieno.
Kitui Woman rep Irene Kasalu called on young ladies to keep away from married or rich men popularly known as "sponsors".
"The government has in place the youth empowerment fund (YEF) and the women empowerment fund (WEF), use these funds to be self-reliant,'' she said
Other leaders at the event included Elsie Muhanda (Kakamega) threatened to lead women in a protest if the case is taken casually.
Muhanda said it is shameful and a taboo for anyone to kill a pregnant woman in the Luhya culture and called for speedy investigations into the matter.
"Everyone knows who was sleeping with Sharon and impregnated her, let that person be brought to book or I will lead Kenyan women in undressing as a protest until the killer is brought to book."
Also present was Bomet county MP Joyce Korir and nominated MP Gideon Keter, Kirinyaga county commissioner Sam Ojwang.