A second passenger, a seven-year-old female also did not survive.
cf:
http://www.seacoastonline.com/news/20180507/eliot-first-grader-local-woman-killed-in-boat-crashI have frequented this river many times with the Piscat River Whaler group.
The accident occurred just adjacent to the Eliot, Maine, boat ramp.
Here is a google photo of the area (Note the tanker docks)
https://www.google.com/maps/place/Dead+duck+boat+ramp/@43.1098755,-70.7911988,2925m/data=!3m1!1e3!4m5!3m4!1s0x89e2be3ba9856c4d:0xb5475695d484cf8a!8m2!3d43.1114965!4d-70.7969854Here is a photo looking upriver just off the ramp (tanker dock in the distance). I am on the left with Russell on the right waiting for others launching. Note the large bouy upriver shown between the boats. This may be the buoy that was hit.

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The Piscatisqua River is tidal, with a currents of around 4-knots (7.4-km/h; 4.6-MPH at max ebb or flood. It takes skill to navigate the bridges, narrow and changing channel with large marine traffic (barges/bulk carriers and oil tankers). Launching and retrieving is also challenging.
The water has mini currents and you get pushed around alot. The bouys are sometimes angled sharply due to the current pushing or pulling on them.
During four gatherings I almost crashed into a bridge fender, crashed into the boat dock attempting to land, and broke a guide roller while launching.
While incredibly beautiful, the Piscatisqua River requires respect and attention day or night.
More photos of the River gatherings here:
https://get.google.com/albumarchive/110044231333731607664?source=pwa