Andrew Tilin, a well-known cycling journalist and amateur bike racer, died from injuries sustained after being hit by a truck early Saturday morning in Austin, Texas, while he was fixing a tire on the side of the road, reports the Austin American-Statesman.

Tilin, 52, was probably most known for writing The Doper Next Door in 2011. The book looked into how testosterone affected bike-racing performance through the lens of an everyday cyclist. During his reporting and research, he took testosterone for nearly a year to see how it affected him both physically and emotionally. Tilin also wrote for Bicycling and was a friend and colleague to many of our staff and contributors. His feature on radical bike-fit guru Steve Hogg, The Heretic Will See You Now, appeared in the November 2014 issue of the magazine.

Tilin wrote frequently for Outside, where he was a contributing editor and in 2014 he reported on the war between bikes and cars. In that story, Tilin noted the persistent and myriad dangers cyclists in the United States face. "Riders take to the roads and take their chances," he wrote. "There, they can encounter distracted, impatient, or drunk drivers, lane-hogging SUVs, deteriorating pavement, and traffic-clogged grids. Multiple dangers exist from coast to coast."

The crash that killed Tilin occurred along Marshall Ford Road and FM 620 Road, medics reported to Outside. Tilin was riding with Austin’s Gruppo VOP cycling club on a foggy morning. About 30 miles into the ride, he pulled onto the side of a road to change a flat tire when a truck careened into him after it was hit by another vehicle that skidded on slick pavement.

The American-Statesman reported that members of Gruppo VOP are planning a memorial for Tilin, who lived in Austin since 2011 and became an active member of the cycling community. Following the news, Tilin’s death was met by an outpouring of emotion on social media during the weekend.

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Here's what Andrew Tilin wrote in an @outsidemagazine story called "Bikes vs Cars: The Deadly War Nobody's Winning"



Sadly Andrew is no longer alive—reportedly hit & killed by someone driving a car as he knelt to fix a flat



This is what we're up againsthttps://t.co/SCsx8uZns5 pic.twitter.com/2MO05QC6Z0 — Peter Flax (@Pflax1) February 17, 2018

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Andrew Tilin (center in picture below) died when a chain reaction crash slammed into while he was fixing a flat on his bicycle on RM 620 near Lake Travis. https://t.co/bQbkruoy72 pic.twitter.com/gAWl22Ds0D — KXAN News (@KXAN_News) February 18, 2018

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Heartbreaking. We've learned Andrew Tilin (on left) was hit and killed while changing his bike tire this morning in West Austin. His close friend tells me "Andrew was one of the finest men to grace this planet." PLEASE be careful on our roads! pic.twitter.com/hptLUBpOrS — Kris Betts (@KrisB_13WHAM) February 18, 2018

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Andrew Tilin, an avid cyclist, author and a former editor at Outside Magazine was killed in a freak bicylce... https://t.co/7CwjhFSGZC — Hunter Allen (@hunterpeaks) February 18, 2018

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Brian Dalek Director of Content Operations, Runner’s World & Bicycling Brian has spent the last 10 years focused on creating compelling news, health, and fitness content—with a particular interest on enthusiast activities like running and cycling.

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