Seven alleged hitmen were shot dead by security forces in a separate incident in Morelos.
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The boy's body was found Thursday alongside a highway in the municipality of Morelos.
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Voters will elect governors in the states of Chiapas, Guanajuato, Jalisco, Morelos, Tabasco and Yucatan.
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Juan Manuel Zamudio was shot by three men who ambushed his car as he was travelling alone in Morelos state.
It is not known who was behind Monday's violence in Morelos but the authorities have blamed the shootings on organised crime.
In the ensuing shoot-out, "seven alleged criminals who were armed" were killed, a statement from by the Morelos prosecutor's office said.
The next Entretrip will take place this April in Puerto Morelos, Mexico.
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There have been a number of shoot-outs in the state in recent months but Morelos had escaped the high levels of violence seen in some other regions.
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