Authorities in Mexico State said that an Institutional Revolutionary Party legislator was killed by an assailant on Sunday, the second politician from that party slain in the past two days.

Jaime Serrano Cedillo, a 45-year-old state deputy, was killed in Nezahualcoyotl, a district that borders Mexico City, the state Attorney General's Office said in a statement. No motive was given for the attack.

Local media reported that he was stabbed in the chest as he walked down a street and was rushed to the hospital by his family, but later died. The assailant fled and no arrests have been made.

Mexico State's PRI Gov. Eruviel Avila Villegas condemned Serrano's killing on his Twitter account and called for an investigation.

Serrano was the second politician from that party killed in the past two days.

On Friday, Eduardo Castro Luque, a PRI deputy-elect in Sonora's state legislature, was shot dead outside his home in Ciudad Obregon two days before he was to take office. Two assassins fled the scene on a motorcycle.