The family of a California lab tech who was stabbed by a homeless career criminal and left to die after another homeless man stole the ambulance on site to save him is suing the city for $40 million. Reinaldo Jesus LeFonts, 68, was charging his Tesla outside the Downey City Library last September when Giovanni Navarro, a man convicted of 28 crimes, knifed him to death, according to police. Paramedics arrived on the scene, known to be a hotbed of crime, when another homeless man, Nicholas