This prompted a second operation in the early hours of Sunday morning that ended with all 27 municipal officers, as well as González, in detention.
Images aired on local media showed them lying face down on the floor with their hands handcuffed behind their backs, before they were taken in a convoy to the state capital Morelia for questioning.
There are numerous cases of local police forces throughout Mexico being in the pay of drug cartels, though the Michoacan authorities have not made any explicit link between the arrest of the police and the murder of the candidate.
Corruption and security are the key issues in Sunday's vote, dominated at a national level by Andrés Manuel López Obrador, the Leftist presidential candidate who is expected to sweep into power.
Experts say the current wave of political murders in Mexico is a sign that organised criminal gangs are seeking to ensure they have friendly officials in government.
The victims are often assumed to have been selected either because they have refused to accept bribes or bow to pressure from the gangs, or because they are already associated with criminal rivals.
Miguel Malagón, a close friend and political aide to Mr Angeles Juárez, told local media that the candidate had not received any threats prior to his murder.
"He was a person who was very well loved in this town," Mr Malagón said. "We had no warning that his life was in danger."
