Walker risked a four-match suspension if he unsuccessfully contested the charge at the Tribunal on Tuesday night.
A rising influence with 37 goals for the year, Walker was suspended for two matches in round seven for a similar sling tackle which dazed Geelong backman Harry Taylor.
The 22-year-old was also reprimanded in round five for making front-on contact to a Port Adelaide player.
A Richmond medical report said Morris had suffered after-effects from the crude tackle in Saturday's game at AAMI Stadium.
Hawthorn's Brent Guerra, Essendon's Stewart Crameri and St Kilda's Brendon Goddard have also accepted suspensions.
Guerra will miss three games for his front-on bump to Carlton's Eddie Betts.
Crameri is out for two games after pleading guilty to a rough-conduct charge against Bulldogs' defender Dylan Addison, who's been left nursing a fractured jaw.
Goddard has also been banned for two matches for striking North Melbourne's Sam Wright.
Richmond's Daniel Jackson will contest his case at the Tribunal on Tuesday night after challenging a two-match ban for striking Adelaide's Chris Knights.
Jackson's existing bad record of seven matches suspended within the past three years boosts his penalty by 50 per cent to 187.50 demerit points.
The defender also has 94.66 demerit points carried over from within the past 12 months, increasing the penalty to 282.16 points.
Western Bulldogs' midfielder Ryan Griffen has accepted an $1800 sanction for making negligent contact with an umpire.