Who murdered PRI's federal deputy?

Imagine the scenario: A U.S. congressman is abducted along with an assistant. They are found dead by farmers two weeks later, their bodies decomposing.

Two men are arrested and confess to the murder; they are are also in possession of a huge amount of cash that they declare was the payment for the hit job, and also provide them with cars. Their contractor, they say, was a mayor from the dead congressman's party.

How hard should it be to prove or disprove their story? How likely is it that the mayor would simply continue in office and that the investigation would pretty much come to a standstill?

This appears sadly to be the case in Guerrero, where PRI mayor Willy Reyes Ramos is signaled as the man behind the murder of PRI federal deputy Moisés Villanueva de la Luz. As El Universal reports, the murder remains unresolved, almost four months later.

Price of a federal deputy's head: 300,000 pesos. Murderers caught.

300,000 pesos, or about $22,000: This is apparently the price for murdering a Federal Deputy in Mexico.
It seems Mexican authorities have actually captured the killers of PRI deputy Moisés Villanueva de la Luz, who was recently found murdered in Guerrero. According to the state prosecutor, four men carried out murder of Villanueva and his assistant, yet the mastermind was apparently a town councilor of Tlapa de Comonfort, whose name is still withheld, as he is still on the loose.

Yet who ordered the councilor to arrange for the deputy's murder? .