GM President Dan Amman left Lyft's board only two years after the companies formed a private partnership that included a $500 million investment from GM and a seat on the board, according to Fortune.
The partnership's original goal was to deploy GM autonomous vehicles into Lyft's fleet of ride-hailing cars. SoftBank, which has invested in Lyft's rival Uber, recently invested $2.25 billion into GM's self-driving car unit, Cruise Automation. Meanwhile, Lyft has forged partnerships with several other self-driving car companies, including Ford.
Mr. Amman's departure was said to be amicable, and he selected his replacement Maggie Wilderotter, former CEO of Frontier Communications.
"As both companies have evolved, we understandably find ourselves in somewhat competitive positions," a source close to the companies told Fortune.